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Journal of Stress Physiology & Biochemistry, Vol. 20, No. 1, 2024, pp. 111-116 ISSN 1997-0838 Original Text Copyright © 2024 by Das, Kole and Kole
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Characterization of Induced Mutants in Short Grain Aromatic non-basmati Rice Badshabhog
Raghunath Das1,2, Paresh Chandra Kole1* and Aritabha Kole
,3
1 Department of Genetics & Plant Breeding, Institute of Agriculture, Visva-Bharati, Sriniketan- 731236, West Bengal, India
2 Department of Agriculture and Farmers' Empowerment, Government of Odisha, Balasore, Odisha India
3 ICAR-Indian Institute of Agricultural Biotechnology, Garhkhatanga, Ranchi- 834010, Jharkhand, India
*E-Mail: [email protected]
An experiment was conducted to evaluate the agronomic performance of advance generation 28 mutant families in the M4 generation. The mutant families were derived following pedigree method by treating aromatic short grain non-basmati land race Badshabhog with 200, 300, 400Gy doses of gamma rays. The mutant families retained the aroma of mother and were 10-15 days earlier. Agronomic performance reveals that height of many families was reduced which will render plants to be lodging resistant and responsive to higher doses of fertilizer. Some of the families have desirable mutant characters viz. flag leaf, panicle exsertion, panicle number and test weight. Majority of the families have reduction in panicle length, spikelet and grain number, spikelet fertility and grain yield which may be improved through gene cleaning. Segregation patterns of the mutant characters indicated that mutations are recessive and micromutations in nature. Appearance of multiple mutant characters in a plant may not be due to true mutations for all such characters, but may be due to pleiotropic effects of mutant genes. The mutants may be used directly and/or indirectly in recombination breeding programme for their beneficial mutant characters through Mutant x Parent and Mutant x Mutant crosses.
Key words: Aromatic rice, non-basmati, induced mutants, agro-botanical characters
Received November 2, 2023
112
Characterization of Induced Mutants.
Aromatic rice is grown almost in all rice growing areas of India. Outside the traditional basmati growing region of India, location specific age-old aromatic landraces are grown. Such aromatic landraces are tall indica photo-sensitive low yielding type with the kernel characters non-conforming to the standard of basmati rice traded in the international market. However, these aromatic non-basmati rices are popular among farmers. Badshabhog is such aromatic short grain non-basmati rice grown in different pockets of southern parts of West Bengal. Improvement in plant type through gamma ray induced mutation of Badshabhog resulted in identification of a number of short height mutants with alteration in a number of agro-morphic characters in the M3 generation. The present study was aimed at evaluating the performance of some mutant families in the M4 generation for their potential use in breeding aromatic rice.
MATERIALS AND METHODS
The experimental material used in the present investigation comprised 28 mutant families belonging to the M4 generation along with their mother Badshabhog. The procedure of induction of mutations has been reported elsewhere (Kant and Chakraborty, 2021). Pedigree method was followed onwards the M2 generation. The nomenclature of the mutants were as follows: Mut, followed by a number to represent the dose in gray/100, followed by a number in parenthesis to represent the M2 family, followed by a number indicating plant number selected in the M3 generation. Superscript indicates morphologically near-similar plant apparently differing mainly in one character. Seeds harvested from such selected M3 plant were used to raise M4 family for conducting the experiment. The number of families in different doses are in 200Gy: five families (2+1+1+1), in 300Gy: fifteen families (1+8+6) and in 400Gy: eight families (2+1+3+2) (Values greater than one in the parenthesis represent number of sister families derived from a segregating population in the M3 generation).
The field experiment was conducted in a randomized complete block design (RCBD) with 3 replications during the kharif (warm wet) seasons of 2019 (July-December)
at Agriculture Farm of Palli-Siksha Bhavana (Institute of Agriculture), Visva-Bharati, Sriniketan. The farm is situated under sub-humid, subtropical, lateritic belt of West Bengal at 230 39' N latitude and 870 42' E longitude with an average altitude of 58.9 meters above mean sea level. The seeds of each family were sown in the nursery bed with the onset of monsoon. Thirty-day-old seedlings were transplanted under puddled field condition, with a basal fertilizer dose 60:30:30 kg N: P: K per hectare. Single seedling was transplanted in each hill. Each plot consisted of five rows of three-meter long with inter- and intra-row spacing of 20 cm and 15 cm, respectively. Standard cultural practices were followed for raising a healthy crop. Ten plants in each plot were selected randomly for recording observations for plant height, flag leaf area, panicle exsertion, total effective tiller plant-1, main panicle length, total spikelets and grains panicle-1, fertility(%), test weight and grain yield. Data were analysed following Gomez and Gomez (1983).
RESULTS AND DISCUSSION
The analysis of variance of twenty nine families (Table 1) for ten quantitative characters viz., plant height, flag leaf area, panicle exertion, effective tiller, main panicle length, total spikelet per panicle, filled grains per panicle, spikelet fertility (%), test (1000-grain) weight and grain yield per plant revealed the mean squares due to families for all the above characters are highly significant which indicated existence of genetic variability among the experimental materials. The mean performances of twenty nine families for ten characters (Table 2) are as follows:
Plant height: Plant height varied from 86.97cm [Mut3(102)382] to 164.27 cm [Mut4(48)22] with a grand mean of 131.91cm. Some short stature mutant families Mut2(381)32, Mut3(102)361, Mut3(102)362,
Mut3(102)381, Mut3(102)382, Mut3(102)391, Mut3(102)392, Mut4(33)25, Mut4(33)26 resistant to lodging could be utilized directly subject to their yield performance or indirectly in cross-breeding programme to develop semi-dwarf high yielding variety.
Flag leaf area: The range of this character is varied from 7.66 cm2 [Mut3(102)391] to 23.37cm2 [Mut4(100)7]
with a grand mean of 16.49 cm2. Some mutant families Mut2(207)2, Mut2(267)24, Mut3(58)9, Mut3(58)10, Mut3(58)27, Mut4(33)26, Mut4(47)6, Mut4(48)20, Mut4(100)6 and Mut4(100)7 were having higher flag leaf area than mother family Badshabhog. Some mutant families were on par with mother family Badshabhog, while thirteen families had less flag leaf area. Wide variation in this character is due to mutational changes in the genetic system(s) associated with determining the flag leaf length and/or its breadth. Flag leaf plays important role in source-sink relationship. The mutant families having desirable flag leaf area are important for increasing grain yield in rice.
Panicle exsertion: This character varied from 4.53 cm in Mut4(47)6 to 20.17 cm in Mut4(100)6 with a grand mean of 11.26 cm. Panicle exsertion in Mut3(58)3, Mut3(58)10, Mut4(48)20, Mut4(48)22, Mut4(100)6 was more than the mother variety Badshabhog. Some mutant families were on par with mother family, while sixteen mutant families had less exssertion than Badshabhog. Exsertion of panicle is due to differential length of first (top) internode and flag leaf sheath. The wide difference in exertion is due mainly to variation in the length of panicle bearing first internode which is longest among all internodes. Mutational treatment affecting plant height, although causes proportional changes in the length of almost all internodes, causes drastic changes usually in the first internode, while leaf sheathes are nearly unaffected. Complete exsertion of panicle is highly desirable, but long exsertion, particularly in tall indica rice leads to lodging susceptibility when panicle gains weight on grain filling.
Effective Tiller: The number of productive tillers per plant were found to be lowest 9.33 in Badshabhog (control) and highest 33.17 in mutant family Mut3(102)362 with a general mean of 17.70 tillers per plant. All the mutant families having more number of total effective tiller plant-1 than mother family Badshabhog except Mut4(48)20 which was on par with Badshabhog. Mutant families having greater number of total effective tiller plant-1 are desirable if yield per panicle is not affected to such an extent so as to reduce productivity per unit area.
Main Panicle Length: The mutant family Mut3(102)392 and parent family (control) exhibited lowest (13.33 cm) and highest (29 cm) panicle lengths, respectively with a grand mean of 23.17 cm. Two mutant families Mut3(58)3, Mut4(48)22 were having panicle length on par with mother family. Rest mutant families showed main panicle length less than mother. Drastic reduction in panicle length will reduce grain yield per panicle which is common in mutants. Therefore, reduction in panicle length, unless compensated with panicle density (grain number per unit panicle length), will have reduced seed yield.
Total Spikelet panicle-1: Wide range of variability was obtained for total number of spikelets panicle-1 ranging from 47.39 [Mut3(102)392] to 281.22 [Badshabhog] with a grand mean of 142.57. Unfortunately, all the mutant families had less number of total spikelets per panicle than mother family Badshabhog. This indicated no compensation through panicle density. Therefore, the mutants carried the harmful effect for sink number.
Filled grain panicle-1: Wide range of variability was obtained for total number of filled grain panicle-1 ranging from 32.26 [Mut3(102)391] to 246.78 [Badshabhog (parent family)] with a grand mean of 108.56. In this case all the mutant families were of lower value for filled grain per panicle than mother family Badshabhog. This will have a direct bearing on seed yield unless compensated by sink size.
Spikelet fertility (%): The range of variation for this character varied from 60.38 to 88.16 with a grand mean of 74.84. The maximum fertility percentage was recorded 88.16 in Badshabhog (control) and the minimum fertility percentage was recorded 60.38 in mutant family Mut3(102)381. Some mutant families having fertility (%) on par with mother family were Mut2(267)24, Mut2(381)32, Mut3(58)3, Mut3(58)9, Mut4(48)22 and Mut4(100)7. All other mutant families were of lesser fertility (%) than mother family. Reduction in spikelet fertility is very common harmful effect associated with mutational events. Therefore, elimination of such lethal genes through gene cleaning is very important for improvement in performance of the mutants.
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for ten quantitative characters in rice
Source d.f. Plant Height (cm) Flag Leaf Atea (cm3) Panicle Exsertion (cm) Total Effective HI 1er Main Panicle Length (cm) Spikelet Number per Panicle Grain Number per Panicle Spikelet Fertility (%} Test Weight (g) Grain Yield (g)
Replication 2 18.1S 3.06 5.39 2.59 0.36 86.31 72.31 10.53 016 10.14
Genotypes 28 1810.31" 67.47" 48.13" 12.47" 61.59** 9295.19" 6712.04" 58.94" 4.01" 34.51"
Error 56 18.40 3.61 2.13 7.70 1.20 166.95 106.07 5.44 0.36 5.06
' Significant at P= 0.05 and P= 0.01, respectively
Name Plant Height (cm) Flag Leaf Atea (cin!) Panicle Exsertlon Total Effec tive Tiller Main Panicle lengthfcm] Number of Spikelet pi panicle r Number of Grain per panicle Spikelet Fertility (%) Test Weight (%) Grain Yield (gm)
Badshabhog 163.00 18.65 14.87 9.33 29.00 281.22 246.76 88.16 (70.07) 10.31 22.30
Mut2(30)17 136.82' 16.33= 11.91= 12.30- 25.10' 169.71= 1.26.03= 74.26 (59.52)' 11.73" 15.06=
Mut2(30)18 135.№ 14.71= 11.05= L0.77- 24.76' 150.63= 109.24* 72.51 (58.39)' 10.44" 12.54=
Mut2(207]2 134.14' 19.23* 5.80' 16.50" 24.53' 181.40= 114.54= 63.05 (52.59J' 11.45" 17.24-
M u12(267)24 136.46= 19.42* 11.43= 10.97- 25.11= 158.59- 121.06= 76.30 (60.68)" 10.49" 14.85=
M u 12(381)32 123.86= 17.03= 5.67' 12.95* 22.87' 153.42= 125.57* 81.67(64.81)" :0.64" 14.64=
Mu 13(30)4 150.26= 1767* 14.16" 12.97- 25.19' 200.40= 131.19= 65.46 (54.01)' 9.20= 13.47=
Mu13(58)3 160.43s" 15.99= 17.15* 15.53" 27.66" 172.37® 1.40.02* 84.37 (64.46)" 11.89" 20.94"
Mu13(58)8 108.57* 14.14* 13.77" 25.80" 1.8.60' 49.37* 34.73* 70.35 (57.06)' 11 si- 8.42'
Mu 13(58)9 155.23= 21.16* 12.95' 11.57" 26.14' 186.01' 151.07* 81.23 (64.34)" ll Ol- 17 90e
Mu 13(58)10 159.22" 19.41* 15.04" 13.60" 26.72' 155.65= 1.24.22= 79.95 (63.45)' li. 27" 19.89=
Mu13(58)11 134.82= 17.561 11.27= 11.61* 25.22' 163.43= 1.21.69= 74.44 (59.64)= 10.51" 14.06=
Mu13(58)12 137.21= 16.41= 12.17' 10.13* 25.13' 154.67= 117.79= 75.99(60.67)' 10.25" 12.81=
Mu13(58)13 137.11= 17.15= 12.56' 12.47" 25.19' 160.21= 1.22.10= 76.21(60.83)' 10.92' 14.04=
Mu13(58)27 142.42= 19.77* 10.48' 12.57" 25.21' 155.33= 117.62= 75.59(60.44)' 11.44" 15.41=
M u 13(102)3 51 92.81= 9.26= 6.85' 27.43" 1.8.61' 51.00= 37. 72.52 (58.39)' 10.62" 10.04=
M u 13(102)3 53 94.26= 7.69= 9.17' 33.17* 17.77* 53.61' 32.33* 61.07 (51.51)' 12.68* 12.42=
Mut3(102)36L 96.43= 9.92= 7.78' 22.10- 1.8.13' 62.46= 49.86= 60.38 (51.03)' 12.90- 11.44=
M u 13(102)36= 66.97= 7.84= 6.89' 21.60- 1.6.57' 64.49" 47.93= 74.32 (59.57J' 14.76* 12.41=
Mut3(102)39" 69.55F 7.56= 7.89' 27.20* 17.22' 49.66= 32.26* 65.48 (54.06)' 1083' 9.05=
M u 13(102)39' 89.40= 8.13= 7.33' 25.33* 1.3.33' 47.39" 33.62* 70.94 (57.41)' 11.17* 9.011
Mu14(33)25 128.42= 20.30* 11.06= 15.75" 23.29' 188.24= 1.39.66= 74.18 (59.53)' 8.49- 18.03=
Mu14(33)26 129.70= 19.75* 12.77' 11.23* 23.87' 139.47* 104.39= 74.65 (59.96)' 10.29" 12.45=
Mu14(47)6 138.92" 22.14* 4.53' 11.73" 24.00' 147.46' 116.02* 78.70 (62.58)' 10.39" 12.02=
Mu14(48)19 135.40= 16.73- 9.82' 11.93' 25.37' 162.25= 1.27.65= 78.79 (62.59)' 10.60" 13.84=
Mu14(48)20 161.091 22.55' 16.04" 9.87" 26.33' 190.27* 147.64* 77.40 (61.64)' 11.35" 15.49=
Mu14(48)22 164.27* 17.571 16.49" 11.40* 27.58" 15873® 12875e 81.10 (54.24)" 101» 14.90=
M u 14(100)6 157.12= 20.68' 20.17- 12.50* 25.11= 153.66* 119.66= 77.68 (51.63)' 10.44" 16.45=
M u 14(100)7 146.35= 23.27* 5.53' 14.37" 24.50' 152.23* 1.26.93= 83.39 (65.95) " 9.90= 13.84=
Range Max 164.27 23.27 20.17 33.17 29.00 281.22 246.76 88.17 (70.07) 14.76 22.30
Mir 66.97 7.66 4.53 9.33 1.3.33 47.39 32.26 60.38 (51.03) 8.49 6.42
GM 131.91 16.49 11.26 15.67 23.17 142.57 1.08.56 74.64 (50.05) 10.96 14.30
CV 3.25 11.53 12.98 L7.70 4.73 9.06 9.48 10.35 j3.86) 5.69 15.76
CD (5%) 7.00 3.10 2.38 4.53 1.78 21.10 1.6.80 3.60 LOO 3.68
CD (1%) 9.31 4.12 3.16 6.02 2.37 28.06 22.34 5.05 1.33 4.89
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weight than mother family Badshabhog, twelve mutant families on par with mother family and three mutant families from higher doses of radiation had lower test weight than mother family. Mutant families having test weight higher than or at par with the mother variety are important.
Grain yield Plant-1: Yield per plant varied from 8.42g to 22.30g with a grand mean of 14.30 g. Parent family (Badshabhog) had highest yield per plant and mutant family Mut3(58)8 has minimum yield per plant. Mutant family Mut3(58)3 showed on par with mother family. All other mutant families were low yielder than the mother family. However, Mut2(207)2 had short stature and considerable yield.
From the values of coefficient of variation, it was observed variability was highest in effective tillers plant-1, followed by grain yield plant-1, panicle exsertion, flag leaf area, filled grains panicle-1 and spikelets panicle-1. Considerable amount of variability for tillers per plant (Selvaraj et al., 2011; Sharma et al., 2014; Riadi et al., 2018; Kumari et al., 2019), grain yield plant-1(Sharma et al., 2014; Riadi et al., 2018), panicle exertion (Sameera et al., 2016), flag leaf area (Pratap et al., 2012), fertility percent (Kumari et al., 2019), filled grain panicle-1(Pandey et al., 2012; Sharma et al., 2014; Riadi et al., 2018) has earlier been reported.
Performance of induced mutants of aromatic non-basmati rice has earlier been reported (Kole and Chakraborty, 2007; Kole et al., 2012, Hasib et al. 2019). The mutants were identified in the M2 generation, indicating mutational events as recessive in nature. Segregation pattern indicated the mutational changes are due to micromutaions (Kole et al., 2007). Changes in multiple characters in a family may be due to pleiotropic effects of mutant genes (Kole, 2007)
All the mutant families were early flowering by 10-15 days compared to the mother variety and retained the characteristic aroma of Badshabhog. The overall performance of the mutant families indicates that Mut2(207)2, Mut4(33)25, Mut2(30)17 and Mut3(58)27 can be tested under different agronomic management for judging their potential for direct use. The other mutants Mut3(58)11, Mut3(102)382 and Mut4(48)19 could be utilized indirectly in recombination breeding
programme for their beneficial mutant characters
through Mutant x Parent and Mutant x Mutant crosses.
CONFLICTS OF INTEREST
The authors declare that they have no potential
conflicts of interest.
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