Abstract
Salinity being a serious limitation to crop production is an established fact since ages. It has adversely affected the adaptive behavior of our field crops particularly at seed germination and seedling stages. Identification of particular plant traits conferring salinity tolerance is important for inducing genetic variation among the target traits and adjusting the selection pressure for them in field. This experimental study was conducted to explore percent (%) weight loss of roots and shoots at increasing salt stresses (control, 10 dS m-1 and 15 dS m-1) along with certain dry weight and cationic ratio tolerance indices. The experiment was conducted in the glasshouse to screen seedlings of 25 tomato genotypes. Principal component analysis and correlation analysis were used to screen the genotypes for variability and salt tolerance. Based on associative interactions for salt tolerance traits and highly negative response towards weight percent (%) reductions, three genotypes were identified as salt tolerant; BEAVER LODGE SLICER, ZARNITZA, and FORME DE COEUR. Two genotypes GLACIER and Rio-GRANDE were highly positive for K+/Na+ and Ca2+/Na+ ratios tolerance indices. Based on these findings, the genotypes BEAVER LODGE SLICER, ZARNITZA and FORME DE COEUR are suggested to be planted in salt affected area. The six genotypes (ANAHU, LO-2707, 17860, UOVO ROSEO, NAGINA and LA-2821) showed significant negative behavior towards weight % reduction, and a little positive towards salt tolerance indices were considered as moderately salt tolerant. Key words: Weight percent reduction, NaCl, tomato seedling, physio-agronomic, salt tolerance.
Highlights
Over 800 million hectares of land (>6%), including one third portion of the cultivated land, throughout the world are salt affected (FAO, 2008; Naz et al, 2010; Kosová et al, 2013)
Based on associative interactions for salt tolerance traits and highly negative response towards weight percent (%) reductions, three genotypes were identified as salt tolerant; BEAVER LODGE SLICER, ZARNITZA, and FORME DE COEUR
The genotypes BEAVER LODGE SLICER, ZARNITZA and FORME DE COEUR are suggested to be planted in salt affected area
Summary
Over 800 million hectares of land (>6%), including one third portion of the cultivated land, throughout the world are salt affected (FAO, 2008; Naz et al, 2010; Kosová et al, 2013). Out of 230 million ha of total irrigated land, 45 million ha (about 20%) are salt affected (FAO, 2008). There is merely 15% land that is irrigated out of total cultivated, but it is producing world’s one third food and has productivity twice in contrast to rainfed (FAO, 2008; Kosová et al, 2013). 2% (32 million ha) of 1500 million ha dryland used for.
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