Physio-biochemical responses and defining selection criteria for drought tolerance in Sorghum bicolor


Forty cytoplasmic male sterile (CMS) sorghum lines were evaluated for different physiological and biochemical
traits under drought stress. Considerable genetic variability was found among all physio-biochemical traits i.e.
water potential (Ψ w), stomatal conductance (gs), photosynthetic efficiency, acid detergent fiber (ADF), neutral
detergent fiber (NDF), ash and sugar contents. Results indicated that ash contents were found to be most adversely
affected by drought stress followed by sugar contents and stomatal conductance respectively. However, the
values of crude protein, acid detergent fiber (ADF) and neutral detergent fiber (NDF) were observed to be increase
under stress condition. Principal component analysis (PCA) was applied to recognize drought tolerant lines.
Selection criteria was based upon findings of correlation analysis among all studied traits. The positive association
of water potential, stomatal conductance and photosynthetic efficiency with desirable traits viz. ash and sugar
contents; and NDF association with undesirable traits viz. ADF and NDF revealed a way forward to design future
breeding programs of sorghum crop under the prevailing scenario of climate change.


Cytoplasmic male sterile, traits, variability, multivariate, water potential and association

Full Text:


Maydica - A journal devoted to maize and allied species

ISSN: 2279-8013