GENETIC CHARACTERIZATION AND PERFORMANCE EVALUATION OF ELITE COTTON STRAINS FOR MORPHOLOGICAL AND PHYSIO-CHEMICAL TRAITS UNDER HEAT STRESS CONDITIONS

S HUSSAIN; MM KHAN; I TALIB; M KHALID; M ZUBAIR; G MURTAZA; I AKHTAR; MJ QAMAR; MR FAROOQ; M ASHFAQ; MSJ BUKHARI; SWH SHAH; B ALI; SF NAYAB; MI AKRAM; S NAZAR; S KAUSAR; M ASIF; S JAMIL; S REHMAN; M SALEEM; MI YOUSAF; M LUQMAN

doi:10.54112/bcsrj.v2024i1.725

Authors

S HUSSAIN Cotton Research Station (CRS), 63100, Bahawalpur, Pakistan
MM KHAN Regional Agricultural Research Institute, Bahawalpur, 63100, Pakistan
I TALIB Institute of Industrial Biotechnology, Governmental College University, Lahore, Pakistan
M KHALID Regional Agricultural Research Institute, Bahawalpur, 63100, Pakistan
M ZUBAIR Agricultural Research Station, Bahawalpur, 63100, Pakistan
G MURTAZA Pesticide Quality Control Laboratory, 63100, Bahawalpur, Pakistan
I AKHTAR Regional Agricultural Research Institute, Bahawalpur, 63100, Pakistan
MJ QAMAR Soil Fertility (Field), Bahawalpur, 63100, Pakistan
MR FAROOQ Soil Fertility (Field), Bahawalpur, 63100, Pakistan
M ASHFAQ Central Cotton Research Institute, Multan, Pakistan
MSJ BUKHARI Agricultural Research Station, Bahawalpur, 63100, Pakistan
SWH SHAH Entomological Research Sub-Station, Bahawalpur, 63100, Pakistan
B ALI Sorghum Research Sub-Station, Dera Ghazi Khan, 32200, Pakistan
SF NAYAB Sorghum Research Sub-Station, Dera Ghazi Khan, 32200, Pakistan
MI AKRAM Agricultural Research Station, Bahawalpur, 63100, Pakistan
S NAZAR Soil and Water Testing Laboratory, Gujranwala, Pakistan
S KAUSAR Pesticide Quality Control Laboratory, 63100, Bahawalpur, Pakistan
M ASIF Soil and Water Testing Laboratory, Bahawalnagar, Pakistan
S JAMIL Soil and Water Testing Laboratory, Bahawalnagar, Pakistan
S REHMAN Soil and Water Testing Laboratory, Bahawalpur, 63100, Pakistan
M SALEEM Soil and Water Testing Laboratory, Vehari, Pakistan
MI YOUSAF Cotton Research Station (CRS), 63100, Bahawalpur, Pakistan
M LUQMAN Govt Seed Farm, Dhakkar, Pakpattan, Pakistan

DOI:

https://doi.org/10.54112/bcsrj.v2024i1.725

Keywords:

Correlation, Cluster Analysis, Photosynthesis, Antioxidants, CLCuV, Whitefly

Abstract

One of the key steps in developing heat-tolerant, climate-smart cotton genotypes is evaluating and screening available cultivated germplasm. The current study was designed to evaluate the key cotton strains developed for release in heat-prone areas of Punjab and Pakistan. Thirteen cotton strains, along with check variety BH-184, were sown under randomized complete block design (RCBD) in triplicates. The plant-to-plant and row-to-row distances were maintained at 30 cm and 70 cm, respectively. The results revealed the presence of highly significant variations among cotton strains for studied plant traits in 13 cotton strains. Correlation analysis unveiled the presence of highly significant and positive correlation of seed cotton yield with net photosynthetic rate (r = 0.982**), total chlorophyll contents (r = 0.976**), superoxide dismutase (r = 0.966**), bolls per plant (r = 0.786**), nodes per plant (r = 0.683**), plant height (r = 0.653**) and sympodia per plant (r = 0.623**) while strong negative correlation with superoxide dismutase (r = -0.952**). Cluster, principal component and biplot analysis classify cotton strains into groups based on their performance under heat stress conditions. These analyses verified the results obtained through correlations and further revealed that net photosynthetic rate, total chlorophyll contents, superoxide dismutase, plant height and sympodia per plant and superoxide dismutase were the most divergent traits and must be considered in developing a scheme to develop heat-tolerant cotton genotypes.

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