Authors:M. Gholipoor, K. Ghasemi-Golezani, F. R. Khooie, and M. Moghaddam
In order to investigate the effects of salinity on the early seedling growth of chickpea, four chickpea cultivars, Jam, Hashem (kabuli type: large seeded genotypes with light salmon colour), Kaka and Pirooz (desi type: small seeded genotypes with different colours), were grown in pots containing soils with 0.9 (control), 2.6 and 4.9 dSm-1 salinity. The shoot/root ratio of Pirooz was consistently reduced by increasing salinity at all sampling stages. Under saline conditions, the reduction in seedling growth, shoot water content, root and shoot K+ concentration and the increase in root and shoot Na+ concentration were more severe in the kabuli type than in desi type cultivars. Considering path coefficients, increasing seedling K+ concentration and uptake of water from the soil favoured salt-stressed seedling growth. Increasing K+ content alleviated the deleterious effects of root Na+ to a greater extent than that of shoot Na+. On the other hand, a higher percentage of the decrease in seedling growth as the result of Na+ was due to shoot K+ deficiency than to root K+ deficiency.
Authors:M. Gholipoor, A. Soltani, F. Shekari, and Fb. Shekari
In order to investigate the effects of salinity on water use efficiency (WUE) and its components, i.e. transpiration efficiency (TE), uptake efficiency (UE) and harvest index (HI), in chickpea, four chickpea cultivars were grown in pots containing soils with 0.8 (C=control), 2 (S1) and 3.9 (S2) dSm-1 salinity. At S1, the WUE of all cultivars increased, but subsequently decreased with increasing salinity. The relative contribution of TE to the sum of squares of WUE was relatively higher than UE and HI. Therefore, the TE component had a more crucial improving effect on WUE than the other two WUE components. At the S2 level, UE and HI were lower than in the control. Path analysis revealed that the simultaneous selection of non-stressed cultivars for higher TE and HI, and of salt-stressed cultivars for better TE and UE should be practised to improve WUE under non-stressed and high stress conditions, respectively. With respect to ion contents, the screening of salt-subjected cultivars for higher K+ content in the roots might result in an increase in both the total dry matter (TDM) and WUE of chickpea under stress conditions. Additionally, the selection of non-stressed cultivars on the basis of higher shoot Ca2+ concentration might stimulate the TDM and WUE of chickpea under non-stressed conditions.