Expression of a boiling-stable protein (BsCyp) in response to heat shock, drought and ABA treatments in Sorghum bicolor

Abstract

Nitrogen fixation and assimilation in nodules and roots were studied in soybean (Glycine max L.) exposed to different levels of aluminium (Al) stress (0, 50, 200 and 500 lM). Al at 500 lM induced oxidative stress, which became evident from an increase in lipid peroxidation accompanied by a concomitant decline in antioxidant enzyme activities and leghaemoglobin breakdown. Consequently, there was also a reduction in nitrogenase activity. However, the leghaemoglobin levels and nitrogenase activity were unexpectedly found to be higher in nodules when the plants were treated with 200 lM Al. Of the enzymes involved in nitrogen assimilation, the activity of glutamate dehydrogenase-NADH was reduced in nodules under Al stress, but it was significantly higher in roots at 500 lM Al as compared to that in the control. In nodules, the glutamine synthetase/glutamate synthase-NADH pathway, assayed in terms of activity and expression of both the enzymes, was inhibited at >50 lM Al; but in roots this inhibitory effect was apparent only at 500 lM Al. No significant changes in ammonium and protein contents were recorded in the nodules or roots when the plants were treated with 50 lM Al. However, Al at ‡200 lM significantly increased the ammonium levels and decreased the protein content in the nodules. But these contrasting effects on ammonium and protein contents due to Al stress were observed in the roots only at 500 lM Al. The results suggest that the effect of Al stress on nitrogen assimilation is more conspicuous in nodules than that in the roots of soybean plants.

Soil microbial community responses to heat wave components: drought and high temperature

“…Microbial cellular responses to heat and drought damages same DNA lesion induced by both desiccation and radiation stresses (Chanal et al 2006) and the correlation between bacterial cell resistances to ionizing radiation and dehydration (Mattimore & Battista 1996, Rokitko et al 2003 (Mittler 2006). Interestingly, Sharma & Kaur (2009) observed the specific induction of a protein in wheat seedlings under combined drought and heat shock that was not activated under drought or heat shock stress alone. Consequently, the co-occurrence of drought and heat stress may induce new types of responses that would not have been induced by each stress applied individually, but there are still too few studies on soil microbial cells under combined drought and heat stress to confirm this hypothesis.…”

Stress-Induced Proteins in Recalcitrant Seeds During Deep Dormancy and Early Germination

“…The expression of many dehydrins increases by the phytohormone abscisic acid (ABA), they are also referred as RAB proteins (Responsive to ABA) [26][27][28]. On the other hand, protein level of some dehydrins is regulated by low temperature only [22].…”

Identification of aluminum-activated malate transporters (ALMT) family genes in hydrangea and functional characterization of HmALMT5/9/11 under aluminum stress

“…In acidic soil, aluminum (Al) is considered to be the main factor restricting plant growth and crop yield ( Kochian, Piñeros & Hoekenga, 2005 ). Excessive Al in soil or substrate causes a series of negative effects on plant nutrient uptake, enzyme activities, cell division and other physiological and biochemical processes, resulting in the inhibition of root growth and function, which may ultimately affect related processes ( Kochian, 1995 ; Sade et al, 2016 ; Sharma, Vasudeva & Kaur, 2006 ). When Al exists in acidic soil in the form of soluble Al 3+ , it has a toxic effect on plants.…”