In this article we will discuss about the CIS-Acting elements and regulatory role of Dreb-Transcription factors. The promoter region of almost all stress inducible genes contains two major cis-acting elements. One of the most well characterized stress responsive genes, rd 29A (responsive to dehydration) of Arabidopsis contains two kinds of cis-acting elements in their promoter region. One is the ABA-responsive [...]
In this article we will discuss about the effect of freezing temperature tolerance on plants. Manifestation of cold acclamation is accomplished by increased freezing tolerance in several plants. Non-acclimatized plants are injured or killed by temperature above -10°C. Interestingly, certain freezing acclimated tree species can survive freezing temperature between -40 and -50°C, for example, non-acclimated wheat and rye plants are [...]
In this article we will discuss about the stress tolerance by antioxidants production. Abiotic stress including salt, chill and drought in plants induces production of reactive oxygen species (ROS), including superoxide radicals (O2-), hydrogen peroxide (H2O2) and hydroxyl radicals (OH). ROS production in cell is due to altered metabolic functions of cell organelles like chloroplast and mitochondria (Fig. 15.8). Their [...]