By Pranab Basuchaudhuri
Rice is the staple nutrients for greater than 1/2 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 is vital to improve excessive yielding rice types which are tolerant to abiotic rigidity stipulations, akin to drought, salinity, and chilly. This e-book offers a transparent figuring out of chilly pressure in rice within the hopes that it'll supply perception to the topic for extra learn in order that rice vegetation should be grown successfully in chilly areas with excessive productivity.
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Extra resources for Cold Tolerance in Rice Cultivation
Cold temperature Stress in Seed Escape of solutes Enhanced ABA Reduced ROS Incomplete plasma membrane Disturbance in reconstruction of membrane Semisolid gel membrane Retarded Water diffusion & imbibition Inhibition of ASC production Inhibition of GA3 synthesis Unbalance metabolic and enzymetic activities Seed Germination poor or failure Fig. 10 Mechanism of cold effect on Germination. 26 3 VEGETATIVE GROWTH Rice is a low temperature-sensitive crop especially during seedling, tillering, panicle development and flowering stages, which can be easily injured by cold treatment.
1 0 Humid 25C Humid13C Dry 25C Dry 13C Fig. 16 Influence of humidity and temperature on stomatal conductance (after Kuwagata et al. 2012). 35 Cold Tolerance in Rice Cultivation Dry weight (g plant-1) 20 15 10 5 0 Humid 25C Humid13C Dry 25C Dry 13C Leaf area (Cm2plant-1) Fig. 17 Changes of dry weight under varying humidity and root temperature. 1 0 Humid 25C Humid13C Dry 25C Dry 13C Fig. 18 Changes of leaf area under varying humidity and root temperature (at 55 days after planting). Table 10 Nitrate and ammonium uptake (O moles gfw–1) as influenced by temperature in growing rice seedlings.
Polyamines are positively charged at physiological pH and are therefore able to interact with negatively charged molecules, such as nucleic acids, acidic phospholipids, proteins and cell wall components such as pectin. The multiple suggested roles of polyamines encompass involvement in protein phosphorylation, conformational transition of DNA, maintenance of ion balance, prevention of senescence, radical scavenging, membrane stabilization and regulation or gene expression (Fig. 9) by enhancing the DNA binding activity of transcription factors (Bonneau et al.