Physiological effects of chill and drought hardening on cold resistance of the clones of hybrid japonica rice
1989
Gong Ming | Liu Youliang | Zhu Peiren (Nanjing Agricultural Univ. (China). Section of Plant Physiology)
The effects of chill and drought hardening on survival, leaf lethal temperature (LT50), chlorophyll content, electrolyte leakage and photosynthetic rate in the clones of hybrid japonica (Nannong 521) at low temperature were studied. For drought, chill and drought plus chill hardened seedlings, their survival at chilling temperature increased obviously, and leaf LT50 decreased by 1.6 C degrees, 1.8 C degrees and 2.2 C degrees, respectively as compared with nonhardened seedlings. The hardened seedlings could maintain higher chlorophyll content and photosynthetic rate, lower electrolyte leakage at chill temperature. These results indicated that chilling sensitive plant--rice, may increase its resistance to chilling and freezing by chill and drought hardening. The data from the winter survival tests in a simple frame were consistent with the above mentioned results.
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