Performance of sugarcane genotypes under water deficit stress
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
In this study, thirty-three diverse sugarcane (Saccharum spp. complex) genotypes were
evaluated for drought tolerance. All 33 clones were planted in Randomized Block Design
with three-replications under normal (E1), mild water stress (E2) and rainfed (E3)
environments. Analysis of variance revealed significant differences among genotypes for all
the traits under all environments. High magnitude of PCV, GCV, heritability and genetic
advance were recorded for number of tillers (000/ha), number of shoots (000/ha), number of
millable canes (000/ha), cane yield and CCS (t/ha) under both stress conditions. Correlation
study showed that cane yield had significant positive association with number of tillers
(000/ha), number of shoots (000/ha), NMC (000/ha) under all three environments while
CMS%, proline and SOD showed significant positive association only under stressed
conditions; whereas under normal environment, CCS (t/ha) exhibited significant positive
association with brix%, pol%, purity%, CCS%. Regression study revealed that NMC (000/ha)
is a main contributing trait for cane yield; whereas cane yield is major contributing trait for
CCS (t/ha). Pol% and TSS% played major role for CCS%. Eberhart and Russel regression
model analysis revealed that for cane yield, CCS% and CCS (t/ha), 10-genotypes, 12
genotypes and 12-genotypes are stable performing, respectively. GGE biplot analysis showed
that genotypes with above average performances i.e. F 391/14 (26), CoPb 18181 (16), CoPb
94 (9) and F 301/11 (22) for cane yield; CoPb 18181 (16), CoPb 92 (7), CoPb 14185 (14) and
CoPb 18181 (16) for CCSt/ha; F 391/14 (26), CoPb 16181 (15), SA 04-409 (31) and F 3/14
(23) for CCS% were more stable, comparatively. Expression of drought-responsive genes
(P5CS, SOD, DEH, BADH, IGS, cAPX, LEA, TPS, PROT and DRP) were significantly
higher in cultivar F 391/14 (resistant cultivar); whereas for cultivar CoJ 64 (susceptible
cultivar) significant lower expression of genes (SOD, DRP, PROT and BADH)
wereobserved.
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Citation
Rajwant Kaur (2021). Performance of sugarcane genotypes under water deficit stress (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.