Evaluation Of Agronomic Traits Changes In Drought Stress And Their Impact On The Yield Of Mungbean Cultivars And Promising Lines

Zarifinia Nasser; Aynehband, Amir; Lak, Shahram; Modhej, Adel; Ghanbari, Ali Akbar; Sekhavat, Reza
August 2012
Advances in Environmental Biology;Aug2012, Vol. 6 Issue 9, p2480
Academic Journal
Drought stress is one of the most important and effective factors on crops growth & performance decrease. In order to assess changes in agronomic traits under drought stress and their impact on the yield of mungbean cultivars and promising lines in the tropical climate of Khuzestan, an experimental split plot randomized complete block design with three replications was carried out during 2010-2011 in the South West Agricultural Research Center of Iran (Safi-Abad Dezful). Irrigation regime (drought stress) as the main factor involved three levels of irrigation at 120, 180 and 240 mm of evaporation from the evaporation pan (severe stress and as control), and cultivars as sub-factor included of five varieties: Partow, Indian heap and promising lines of cn95, vc6127 and kps1. Traits evaluated included: seeds to pod ratio, number of pods per plant, number of seeds per pod, weight of 100 grains, yield per hectare, biomass, harvest index, leaf area index. Two-year experiment results also showed that water deficit stress significantly reduced the weight of 100 grains, yield per hectare, biomass, leaf area index while it increased the harvest index and the more severe the stress, the more it affects such reductions and the cultivar Partow, has been affected less than other cultivars by this stress. This showed Partow cultivar more adaptability to the harsh environmental conditions of this region, but this cultivar and the Indian heap, had formed a vine-type growth habit due to having an unlimited type of growth and more tender stems after flowering and pod-setting stages, thus harvesting them was more difficult than the promising lines that had a limited type of growth, stronger stems and erect growth habit. The interaction of drought stress and cultivar showed a significant difference between treatments in weight of 100 grains, seeds to pod ratio, number of pods per plant, number of seeds per pod, seed yield per hectare, biomass, harvest index, leaf area index and seed length & diameter at the 1% level of significance. Correlation coefficients between some traits and yield showed a significantly positive correlation of these traits and the yield so that the calculated correlation coefficients were 0.325**, 0.388**, 0.658**, 0.385**, 0.307**, 0.715**, 0.077ns and 0.307* for seeds to pod ratio, weight of 100 grains, biomass, leaf area index, harvest index, number of pods per plant and number of seeds per pod, respectively.


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