Physio-chemical distinctiveness and metroglyph analysis of cotton genotypes at early growth stage under saline hydroponics
2013
Aslam, M. (University of Agriculture, Faisalabad (Pakistan). Dept. of Plant Breeding and Genetics) | Basra, S.M.A. (University of Agriculture, Faisalabad (Pakistan). Dept. of Crop Physiology) | Maqbool, M.A. (University of Agriculture, Faisalabad (Pakistan). Dept. of Plant Breeding and Genetics) | Bilal, H. | Zaman, Q.U. | Bano, S.
A hydroponic study was carried out to determine the response of 13 cotton (Gossypium hirsutum L.) genotypes at three salinity levels viz. 0.8, 8 and 16 dS m-1 for various physiological and biochemical traits. Data were subjected to metroglyph analyses for the estimation of genetic diversity under contrasting salinity regimes. The genotypes were grouped into five clusters with maximum index score of 97 per cluster. Minimum index score of 13 in case of cluster-V under non saline regime was observed. Three clusters were constructed with range of index scores from 119 to 23 at 8 dS m-1, while all genotypes were grouped into five clusters with maximum and minimum index scores 114 and 23 in cluster-I and cluster-IV, respectively at 16 dS m-1. Relative salinity tolerance was also observed among genotypes at two saline regimes. NIAB-111 and Russian (RL) were the most susceptible and SLH-41 and UCD-581 were found the most tolerant at 8 dS m-1, whereas at 16 dS m-1 NIAB-111 and MS-39 were proved most susceptible and Groog-25, FH-982, TX-DOS-5-76C and Russian okra (RL) as most tolerant. We conclude that genotypes belonging to different clusters show diversity in salinity tolerance and can be used for further breeding programs with focus on development of salinity tolerant germplasm on the basis of easily detectable physiological and biochemical criteria.
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