By Pranab Basuchaudhuri
Rice is the staple foodstuff for greater than half the world's inhabitants, but chilly temperatures throughout the cropping interval reason an important lack of yield. to deal with the world's expanding inhabitants, it's important to advance excessive yielding rice forms which are tolerant to abiotic tension stipulations, comparable to drought, salinity, and chilly. This ebook offers a transparent realizing of chilly pressure in rice within the hopes that it'll supply perception to the topic for extra learn in order that rice crops might be grown successfully in chilly areas with excessive productivity.
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Additional info for Cold Tolerance in Rice Cultivation
In particular, it was noted that secretion rates of indica and japonica I have decreased promptly at treatment under 11ºC, but the secretion rate of japonica II was relatively high even at 8ºC. The recoveries of the root growth and secretion rate of exudates of japonica II were higher than those of indica and japonica I. The degrees of recovery in both traits revealed their close relationship with the quantity of secretion rate of exudates under preceding low-temperature condition. Based on these the low-secretion rate under low temperature may be responsible for the interior recovery of the root growth and the secretion rate of the exudates of indica and japonica I in comparision to japonica II.
Screening for cold tolerance based on germination and seeding growth have been attempted in rice as well (Cruz et al. 2006) and there was marked genetic variability for the traits (Satya and Saha 2010). Yoshida (1981b) studied the effect of cold stress at three phases; germination, imbibition, activation and post germination growth. The effect of cold stress was more pronounced at the phase of imbibing and this was regarded as the most sensitive phase. The exposure of seeds to cold stress during this phase has resulted in increased escape of solutes from the seeds.
Cultivars of rice vary in their cold susceptibility with japonica more cold tolerant than indica cultivars. In seedling stage, the synthesis of several new proteins, alternations to lipid saturation and chlorosis, where the newly emerging leaves lack chlorophyll (Kazemitabar et al. 2003). In many plants, chlorophyll biosynthesis in chill (7ºC) is affected by a sharp reduction. Inhibition of chlorophyll biosynthesis was partly due to impairment of 5-aminolevulinic acid biosynthesis. Protochlorophyllide synthesis in chill was inhibited because of defects in protoporphyrin IX synthesis, Mg-chelatase and Mg-protoporphyrin IX, monoesterase cyclase (Tewari and Tripathy 1998).