Responsiable of cotton cultivars to heat and drought stress in phytotron condition
2010
Mali, M. | Sohrabi, B. | Talebi, S. | Arab, J.
Heat and drought stress are the most important of environmental factors that affect cotton growth and development. The goal of this study is introduce cotton' cultivars that have high heat and drought tolerance. Experimental design was factoirial containe 3 factors: l.Heat tension, a.optimal temperature growth b. Heat tension in flowering time 2.Drought stress, a.Irrigation according on water consumption b.Irrigation according on 50%water requirment3.Cotton cultivars,a. Sepid, b. No 200, c.Golestan, d.Tabladila.This study carried out as randomised compelet design with 3 replication in phytotron. Cotton cultivars had significant difference in boll weight. Golestan (c.v) has high photosyntetic power and as semi late partetioning to boll,produced bigger boll (5.1 gr).Intraction effect of cotton cultivars and water consumption on boll weight was very significant. Golestan (cv) not only in irrigated on 100% waterconsumption but also in irrigated on 50% water consumption produced bigger boll respectively 5.2 and 5.l gr. Sepid (cv) as like as 59desu produced big boll(4.1 and 3.7gr respectively in 100% and 50% water consumption). Very likely these cultivars have high ability to change non-structural carbohydrate to soluble form and increase the osmotic pressure of cell sap and these cultivars root able to absorbe more water and soluble nutrients. The results showed that Golestan and Sepid had high heat and drought tolerance specialy in flowering time.
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