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Relations between drought-resistance and chlorophyll content of 25 local upland rice cultivals (Oryza sativa L.)

Water retention ability of leave tissues of twenty five local upland rice cultivars (Oryza Sativa L.) was defined through the amount of water loss through different time frames. The results showed that the amount of water loss of leaf tissues of twenty five local upland rice cultivars through times: one hour, two hours, three hours, four hours, five hours and six hours had increased. | JOURNAL OF SCIENCE OF HNUE Natural Sci. 2010 Vol. 55 No. 6 pp. 161-168 RELATIONS BETWEEN DROUGHT-RESISTANCE AND CHLOROPHYLL CONTENT OF 25 LOCAL UPLAND RICE CULTIVALS Oryza Sativa L. Nguyen Thi Ngoc Lan and Chu Hoang Mau Thai Nguyen University of Education Nguyen Nhu Khanh Hanoi National University of Education E-mail ntnl2008@gmail.com Abstract. Water retention ability of leave tissues of twenty five local upland rice cultivars Oryza Sativa L. was defined through the amount of water loss through different time frames. The results showed that the amount of water loss of leaf tissues of twenty five local upland rice cultivars through times one hour two hours three hours four hours five hours and six hours had increased. Water loss of the same at the one-hour-time range 11.197 to 17.956 up to six-hours-time the amount of water loss in rice varieties have reached a value of about 43.707 to 63.504 . Gb has the highest dehydration resistant and the lowest is Klk. Total chlorophyll content of rice varieties ranges from 1.496 to 1.962 mg g leaving fresh weight and was ranged in order from high to low values of total chlorophyll content Gb gt Bsn gt Md gt Ln gt Bcc gt Kn gt Ss gt BCS gt Nn gt LTN gt Mt gt BLT gt Km gt Nro gt Lo gt Kk gt BCT gt Kp gt Kt gt Bic gt KPL gt Blx gt Kld gt KX gt Klk. Gb still has the highest bond chlorophyll content in all three types chlorophyll a chlorophyll b chlorophyll a b and Klk has the lowest. Total chlorophyll content total bond chlorophyll and dehydration resistant of leaves have close agreeable correlation. It can be based on the chlorophyll content in leaves to initially assess dehydration resistance of plants. Keywords Upland Rice Oryza Sativa L. chlorophyll drought resistance water retention. 1. Introduction One of the consequences of climatic change is increasing drought in many parts of the world including Vietnam. This is also the main cause promoting projects 161 Nguyen Thi Ngoc Lan Chu Hoang Mau and Nguyen Nhu Khanh and .