Cold tolerance in rice cultivation by Pranab Basuchaudhuri

By Pranab Basuchaudhuri

Rice is the staple nutrients for greater than 1/2 the world's inhabitants, but chilly temperatures in the course of the cropping interval reason an important lack of yield. to deal with the world's expanding inhabitants, it is important to enhance excessive yielding rice types which are tolerant to abiotic pressure stipulations, similar to drought, salinity, and chilly. This ebook offers a transparent knowing of chilly tension in rice within the hopes that it'll offer perception to the topic for extra study in order that rice crops will be grown successfully in chilly areas with excessive productivity.

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1954) showed that the depression of mineral absorption came in the order magnesium > manganese > silicon > calcium > nitrogen > phosphorus. The uptake of potassium seemed to be enhanced by low temperature. Fujiwara and Ishida (1963) found that the absorption of manganese was greatly enhanced by low temperature but drop below normal when low temperature treatment was extended. Fujiwara and Ishida (1963) reported that the inhibition of absorption are equally severe at 17°C for phosphorus, potassium, nitrogen, iron, silicon, calcium and magnesium for the first 2 weeks after transplantation.

In this respect Tainung 67 showed the same behavior as of other four japonica varieties (Weng and Chen 1987). Tsunoda and Khan (1968) found differences in the photosynthetic tissue of indica and japonica types. The indica types have arranged chlorenchyma cells sparsely in the mesophyll, the adaxial surface of the mesophyll is flatter. The japonica types have chlorenchyma cells more compactly arranged and the adaxial surface of the mesophyll is very wavy. However, these differences were found only at the seedling stage and not at the later stage of growth.

It appears that rice seedlings grown at optimal temperature (30ºC) were subjected to low temperature (20ºC) stress and several key enzymes involved in ammonium assimilation and carbon metabolism, including glutamine synthetase, NADP-dependent isocitrate dehydrogenase and NADH-dependent glutamate dehydrogenase for rice roots. The nutrient uptake is reduced due to restricted root growth, poor tillering and leaf discolouration. The early vegetative growth stage of the plant life cycle is vulnerable to cold stress marked injuries that have been observed on rice seedlings planted in early spring in temperate and subtropical environment (Andaya et al.

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