Evaluation Of Physiological Traits Changes In Drought Stress, The Application Of Potassium And Their Impact On The Yield Of Mung Bean Cultivars And Promising Lines

Naser, Zarifinia; Aynehband, Amir; Lak, Shahram; Modhej, Adel
October 2012
Advances in Environmental Biology;Oct2012, Vol. 6 Issue 11, p2854
Academic Journal
Drought stress is one of the most important and effective factors on crops growth & its performance decrease, and potassium effective factor causes drought stress effects to decrease. In order to assess changes in physiological traits under drought stress, potassium and their impact on the yield of mung bean cultivars and promising lines in the tropical climate of Khuzestan, an experimental Factorial split plot with random complete blocks designed with three replications was carried out during 2010-2011 in the South West Agricultural Research Center of Iran (Safi-Abad, Dezful). Irrigation regimes (drought stress) as the main factors involved three levels of irrigation at 120, 180 and 240 mm of evaporation according to the evaporation pan. Potassium as the minor factor involved three levels of potassium at zero, 37.5 and 75 kg/ha and cultivar as another minor factor included five varieties: Partow, Indian heap and promising lines of cn95, vc6127 and kps1. Traits evaluated include: chlorophyll a, chlorophyll b, total chlorophyll, and yield per hectare and stomatal Conductance. Two-year experiment results showed that the stress of water deficit significantly reduced the chlorophyll a, chlorophyll b, total chlorophyll in the flowering stage, and also the yield per hectare and stomatal Conductance decreased. By increasing the drought stress, physiological traits related to seed yield were very much affected; however, the use of potassium effective factor causes drought stress effects to decrease. This study showed that Partow cultivar and the Indian heap have more adaptability to the harsh environmental conditions of this region, however, these cultivars, have formed a vine-type growth habit due to having an unlimited type of growth and more tender stems after flowering and pod-setting stages and thus harvesting them was more difficult than the promising lines which had a limited type of growth, stronger stems and erect growth habit. The interaction of drought stress and cultivar, drought stress and potassium, cultivar and potassium and the tripartite interaction showed a significant difference between treatments in chlorophyll a, chlorophyll b, total chlorophyll, yield per hectare and stomatal Conductance at 1% and 5% levels of significance.


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