Abstract
The knowledge about genetic effects controlling drought related parameters is necessary to understand the quantitative nature
of the parameters responsible for drought tolerance mechanism. For instance, MNH-886 and MNH-988 were crossed with FH114 and FH-Kehkshan to develop generations (F1, F2, BC1 and BC2), respectively. Parents and developed generations were
planted in the field area using triplicate Randomized Complete Block Design under two environmental conditions i.e., normal
and drought. Data were recorded for morpho-physiological and biochemical attributes. Mean performance of the traits and
estimation of genetic effects revealed quantitative nature of the traits. The presence of dominance main effect in abundance
along with epistatic interactions particularly additive × dominance and dominance × dominance in most of the traits suggested
for delayed selection in later segregating generations. Additionally, low-moderate narrow-sense heritability also suggested the
same. Interrelationship of physiological and biochemical attributes with yield related traits revealed desirable association that
would be helpful at the time of selection. Thus, the findings could be used as potential material in further breeding approaches
for development of drought tolerant cotton varieties.
Keywords: Generation mean analysis, gene action, correlation coefficient analysis, epistatic interaction, peroxidase activity,
segregating populations.
Musab Imtiaz, Amir Shakeel, Azeem Iqbal Khan, Muhammad Shah Nawaz ul Rehman. (2022) Estimation of genetic effects and interrelationship of morpho-physiological and biochemical attributes for drought tolerance in upland cotton (Gossypium hirsutum L.), Pakistan Journal of Agricultural Sciences, Volume 59, Issue 3.
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