14 research outputs found
Table_1_Spermidine exogenous application mollifies reproductive stage heat stress ramifications in rice.docx
IntroductionRice productivity is severely hampered by heat stress (HS) which induces oxidative stress in this crop. This oxidative stress can be alleviated using various exogenous chemicals, including spermidine (Spd). Therefore, the present study was carried out to characterize HS components and to elucidate the role of exogenous Spd application in rice at the flowering stage. MethodsTwo contrasting rice genotypes, i.e. Nagina22 (N22) and Pusa Basmati-1121 (PB-1121) were placed in temperature tunnels and exposed to HS (38–43°C) with and without Spd (1.5 mM) foliar application during the heading stage till the end of the anthesis stage. ResultHeat stress induced the production of H2O2 and thiobarbituric acid reactive substances, which resulted in lower photosynthesis, spikelet sterility, and reduced grain yield. Interestingly, foliar application of Spd induced antioxidant enzyme activities and thus increased total antioxidant capacity resulting in higher photosynthesis, spikelet fertility, and improved grain yield under HS in both genotypes. Under HS with Spd, higher sugar content was recorded as compared to HS alone, which maintained the osmotic equilibrium in leaf and spikelets. Spd application initiated in vivo polyamine biosynthesis, which increased endogenous polyamine levels. DiscussionThis study corroborates that the exogenous application of Spd is promising in induction of antioxidant defence and ameliorating HS tolerance in rice via improved photosynthesis and transpiration. Thereby, the study proposes the potential application of Spd to reduce HS in rice under current global warming scenario.</p
Presentation_1_Spermidine exogenous application mollifies reproductive stage heat stress ramifications in rice.pdf
IntroductionRice productivity is severely hampered by heat stress (HS) which induces oxidative stress in this crop. This oxidative stress can be alleviated using various exogenous chemicals, including spermidine (Spd). Therefore, the present study was carried out to characterize HS components and to elucidate the role of exogenous Spd application in rice at the flowering stage. MethodsTwo contrasting rice genotypes, i.e. Nagina22 (N22) and Pusa Basmati-1121 (PB-1121) were placed in temperature tunnels and exposed to HS (38–43°C) with and without Spd (1.5 mM) foliar application during the heading stage till the end of the anthesis stage. ResultHeat stress induced the production of H2O2 and thiobarbituric acid reactive substances, which resulted in lower photosynthesis, spikelet sterility, and reduced grain yield. Interestingly, foliar application of Spd induced antioxidant enzyme activities and thus increased total antioxidant capacity resulting in higher photosynthesis, spikelet fertility, and improved grain yield under HS in both genotypes. Under HS with Spd, higher sugar content was recorded as compared to HS alone, which maintained the osmotic equilibrium in leaf and spikelets. Spd application initiated in vivo polyamine biosynthesis, which increased endogenous polyamine levels. DiscussionThis study corroborates that the exogenous application of Spd is promising in induction of antioxidant defence and ameliorating HS tolerance in rice via improved photosynthesis and transpiration. Thereby, the study proposes the potential application of Spd to reduce HS in rice under current global warming scenario.</p
UPGMA tree based on dissimilarity index of 35 SSR markers for 278 lentil genotypes.
<p>UPGMA tree based on dissimilarity index of 35 SSR markers for 278 lentil genotypes.</p
Evanno plot describing estimation of cultigens and wild genotypes ofgenus <i>Lens</i> using LnP(D) derived Δ k for k from 1 to 10.
<p>Evanno plot describing estimation of cultigens and wild genotypes ofgenus <i>Lens</i> using LnP(D) derived Δ k for k from 1 to 10.</p
Model based population structure plot with K = 2, using structure with 35 SSR markers.
<p>Colour codes: Population I red (Wild accessions) and population II green (Cultivars).</p
Evaluation of drought stress tolerance in cultivated and wild genotypes of lentil.
<p>Fifteen and 25 d old plants of cultivated and wild genotypes of lentil (a and d). Plant roots exposed to air for 5h (b and e). Recovery of genotypes in the nutrient solution (c and f).</p
Major allele frequency for microsatellite loci (SSR) in wild and cultivated genotypes.
<p>Major allele frequency for microsatellite loci (SSR) in wild and cultivated genotypes.</p
Seed yield of lentil genotypes grown under low pH condition at Imphal, Manipur, India (pH 4.8) and Basar, Arunachal Pradesh, India (pH 5.1) during 2012–13, 2013–14 and 2014–15.
<p>Data shown are mean ± SEm. Bars that do not share common letters are significantly different by Duncan’s post hoc test at P<0.05.</p
Model based population structure plot with K = 3, using Structure with 46 SSR markers.
<p>Colour codes: red = population I (wild accessions), green = population II (cultigens) and blue = population III (‘ILL’ series of cultigens).</p