scholarly journals The Morpho-Genetic Estimation of Drought Stress in Sunflower Seedlings under Laboratory Conditions

2021 ◽  
Vol 3 (1) ◽  
pp. 01-03
Author(s):  
Uzma Ayaz
Keyword(s):  
Cluster Analysis ◽  
Polyethylene Glycol ◽  
Drought Stress ◽  
Genetic Variability ◽  
Principle Component Analysis ◽  
Water Status ◽  
Germination Percentage ◽  
Shoot Length ◽  
Plant Water ◽  
Stomatal Frequency

Drought stress directly affects the growth along with productivity of plants by altering plant water status. The present study was carried out to characterize the genetic variability for seedling and morpho-physiological parameters in different sunflower genotypes under water stressed conditions. A total twenty seven genotypes including two hybrids, eight advanced lines and seventeen accessions of sunflower (Helianthus annuus L.) were tested against drought stress at seedling stages by applying Polyethylene glycol (PEG). Significant means were calculated among traits using analysis of variance (ANOVA) whereas, correlation and principle component analysis also confirmed that germination percentage, root length, shoot length, chlorophyll content, stomatal frequency are positively linked with each other hence, these traits were responsible for most of variation among genotypes. The cluster analysis showed that genotypes Ausun, line-1, line-2, line-3, 17578, 17570, line-6, line-7 and 17562 are more diverse among all the genotypes.

Fungal endophyte association with Brachiaria grasses and its influence on plant water status, total non-structural carbohydrates and biomass production under drought stress

2016 ◽  
Vol 409 (1-2) ◽  
pp. 273-282 ◽  
Author(s):  
Kennedy Odokonyero ◽  
Tina Botwright Acuña ◽  
Juan Andrés Cardoso ◽  
Juan de la Cruz Jimenez ◽  
Idupulapati Madhusudana Rao
Keyword(s):  
Drought Stress ◽  
Biomass Production ◽  
Water Status ◽  
Fungal Endophyte ◽  
Plant Water Status ◽  
Plant Water

Genotypic variability in plant water status of French bean under drought stress

2011 ◽  
Vol 14 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Apurba Kanti Choudhury ◽  
Abdul Karim ◽  
Moynul Haque ◽  
Qazi Abdul Khaliq ◽  
Jalal Uddin Ahmed ◽  
...  
Keyword(s):  
Drought Stress ◽  
Water Status ◽  
French Bean ◽  
Plant Water Status ◽  
Plant Water ◽  
Genotypic Variability

scholarly journals Functions of silicon in plant drought stress responses

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Min Wang ◽  
Ruirui Wang ◽  
Luis Alejandro Jose Mur ◽  
Jianyun Ruan ◽  
Qirong Shen ◽  
...  
Keyword(s):  
Drought Stress ◽  
Water Balance ◽  
Plant Species ◽  
Stress Responses ◽  
Environmental Conditions ◽  
Water Status ◽  
Stress Conditions ◽  
Plant Water Status ◽  
Future Research ◽  
Plant Water

AbstractSilicon (Si), the second most abundant element in Earth’s crust, exerts beneficial effects on the growth and productivity of a variety of plant species under various environmental conditions. However, the benefits of Si and its importance to plants are controversial due to differences among the species, genotypes, and the environmental conditions. Although Si has been widely reported to alleviate plant drought stress in both the Si-accumulating and nonaccumulating plants, the underlying mechanisms through which Si improves plant water status and maintains water balance remain unclear. The aim of this review is to summarize the morphoanatomical, physiological, biochemical, and molecular processes that are involved in plant water status that are regulated by Si in response to drought stress, especially the integrated modulation of Si-triggered drought stress responses in Si accumulators and intermediate- and excluder-type plants. The key mechanisms influencing the ability of Si to mitigate the effects of drought stress include enhancing water uptake and transport, regulating stomatal behavior and transpirational water loss, accumulating solutes and osmoregulatory substances, and inducing plant defense- associated with signaling events, consequently maintaining whole-plant water balance. This study evaluates the ability of Si to maintain water balance under drought stress conditions and suggests future research that is needed to implement the use of Si in agriculture. Considering the complex relationships between Si and different plant species, genotypes, and the environment, detailed studies are needed to understand the interactions between Si and plant responses under stress conditions.

scholarly journals Comparative productivity and drought response of semi-tropical hybrids and open-pollinated varieties of sorghum

1992 ◽  
Vol 118 (1) ◽  
pp. 29-36 ◽  
Author(s):  
A. Blum ◽  
G. Golan ◽  
J. Mayer ◽  
B. Sinmena ◽  
T. Obilana
Keyword(s):  
Drought Stress ◽  
Grain Yield ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Harvest Index ◽  
Water Status ◽  
Plant Water Status ◽  
Plant Water ◽  
Growth Duration ◽  
Area Index

SUMMARYWhile the relative advantage of hybrids over open-pollinated varieties has long been established for temperate sorghums in developed countries, similar information for semi-tropical sorghums used in Africa and India is relatively scant, especially under conditions of drought stress. This study compared 23 hybrids with 21 open-pollinated varieties, all developed in India and/or Southern Africa. Materials were field-tested under conditions of stored soil moisture at two levels of drought stress (dryland or one supplemental irrigation) at Bet Dagan, Israel in 1989.Irrespective of the water regime, grain yield and harvest index increased and leaf area index decreased with a shorter growth duration of the genotypes. Hybrids were earlier, had a larger leaf area index, more than double the harvest index and produced more grain compared with varieties. In spite of their longer growth duration, varieties were less water-stressed than hybrids, as judged by their midday leaf water potential, relative water content and the extent of leaf rolling. The relatively poor plant water status of the hybrids could be partly ascribed to their larger leaf area index. Hybrids produced more biomass per day than varieties under low stress while varieties produced more biomass per day than hybrids under high stress. Thus, in terms of plant water status and mean daily biomass production, varieties were more drought resistant than hybrids. However, the physiological superiority of the varieties under drought stress did not result in a higher grain yield because of their inherent relatively poor harvest index, typical of the tall and late African sorghums. The superior physiological resistance to drought stress of these varieties could be translated into a yield advantage under drought stress if their potential harvest index is improved.

scholarly journals QTL Mapping for Seed Germination Response to Drought Stress in Brassica napus

2021 ◽  
Vol 11 ◽  
Author(s):  
Mahmoud Gad ◽  
Hongbo Chao ◽  
Huaixin Li ◽  
Weiguo Zhao ◽  
Guangyuan Lu ◽  
...  
Keyword(s):  
Drought Stress ◽  
Brassica Napus ◽  
Seed Germination ◽  
Drought Tolerance ◽  
Germination Percentage ◽  
Shoot Length ◽  
Stress Index ◽  
Phenotypic Analysis ◽  
Genetic Characteristics ◽  
Physical Maps

Drought stress is one of the most environmental abiotic stresses affecting seed germination and crop growth. In the present study, the genetic characteristics of seed germination under drought stress in a Brassica napus double haploid population were analyzed. Five germination-related indexes, including germination percentage (GP), root length (RL), shoot length (SL), fresh weight (FW), and root-to-shoot length ratio (R/S) under control and drought stress, were calculated, and the drought stress index (DSI), including DSI-GP, DSI-RL, DSI-SL, DSI-FW, and DSI-R/S, was determined using the quantitative trait loci (QTLs) analysis based on high-density genetic linkage map. The phenotypic analysis indicated that the R/S is an effective morphological trait in the determination of drought tolerance in the seedling stage. Thirty-nine identified QTLs were observed for these traits and then integrated into 36 consensus QTLs, in which 18 QTLs were found to affect the DSI of four traits (GP, RL, SL, and R/S). Based on the co-linearity between genetic and physical maps of B. napus, 256 candidate genes were detected, and 128 genes have single-nucleotidepolymorphisms/insertion–deletion (SNP/InDel) variations between two parents, some of which were associated with the drought stress tolerance (for example, BnaC03g32780D, BnaC03g37030D, and BnaC09g27300D). The present results laid insights into drought tolerance and its genetic bases in B. napus.

Sign in / Sign up

Export Citation Format

Share Document