scholarly journals Effect Of High Temperature On Yield Attributing Traits In Bread Wheat

1970 ◽  
Vol 36 (3) ◽  
pp. 415-426 ◽  
Author(s):  
Khajan Singh ◽  
SN Sharma ◽  
Yogendra Sharma
Keyword(s):  
High Temperature ◽  
Grain Yield ◽  
Bread Wheat ◽  
Temperature Stress ◽  
Wheat Variety ◽  
Triticum Aestivum L ◽  
High Temperature Stress ◽  
Major Constraint ◽  
Biological Yield ◽  
Heat Susceptibility Index

High temperature stress is major constraint to bread wheat (Triticum aestivum L. Em. Thell) production. Generation of information on the effect of high temperature stress on various traits may be helpful for developing thermotolerance bread wheat variety. An experiment was conducted on a set of 10 diverse genotypes, their 45 F1s and F2s for identification of high temperature stress genotype. The experiment was conducted under normal and late sown condition. The parent HD 2851, P8W 520, and HS 448, and the crosses HS 448 × PBW 520, UP 2614 × K 209 and PBW 520 × HD 2851 for grain yield per plant were least affected under late sown conditions. Heat stress intensity (Dvalue) clearly indicated that grain yield per pant biological yield per plant and grain yield per spike suffered revively under late sown conditions. Keywords: Bread wheat; heat susceptibility index; tolerant genotypes. DOI: http://dx.doi.org/10.3329/bjar.v36i3.9270 BJAR 2011; 36(3): 415-426

scholarly journals Growth and yield components of wheat genotypes exposed to high temperature stress under control environment

1970 ◽  
Vol 34 (3) ◽  
pp. 360-372 ◽  
Author(s):  
M Ataur Rahman ◽  
Jiro Chikushi ◽  
Satoshi Yoshida ◽  
AJMS Karim
Keyword(s):  
High Temperature ◽  
Grain Yield ◽  
Temperature Stress ◽  
Yield Components ◽  
High Temperature Stress ◽  
Relative Performance ◽  
Growth And Yield ◽  
Wheat Genotypes ◽  
Heat Susceptibility Index ◽  
Green Leaf Area

High temperature stress during grain-filling period is one of the major environmental constraints limiting the grain yield of wheat in Bangladesh. Crop growth response and relative performance of yield components of ten wheat genotypes were studied in two temperature conditions in glass rooms in a Phytotron to identify the genotype tolerant to high temperature stress. A favourable day/night temperatures of 15/10, 20/15, and 25/20°C were maintained from sowing to 60 days after sowing (DAS), 61 to 80 DAS and 81 DAS to maturity, respectively, in one glass room (G1); whereas day/night temperatures in another glass room (G2) was always maintained at 5°C higher than that of G1. Green leaf area and number of tillers in different times, number of days for the occurrence of major crop growth stages, relative performance in yield components, grain yield and heat susceptibility index were estimated following the standard methods. The higher temperature enhanced plant growth, flowering, and maturation. Thus the number of days to booting, heading, anthesis, and maturity of wheat were significantly decreased that varied among the genotypes. Green leaf area and productive tillers/plant were drastically reduced in time under high temperature. The reduced number of grains/spike and smaller grain size resulted from drastic reduction in growth duration were responsible for the yield loss of wheat at high temperature. Out of ten wheat genotypes, three were characterized as high temperature tolerant based on their relative performance in yield components, grain yield and heat susceptibility index. Key Words: High-temperature tolerance, wheat genotype, growth and yield components. DOI: 10.3329/bjar.v34i3.3961 Bangladesh J. Agril. Res. 34(3) : 361-372, September 2009

scholarly journals Mapping wheat QTLS for grain yield related traits under high temperature stress

Genetika ◽  
2020 ◽  
Vol 52 (3) ◽  
pp. 1107-1125
Author(s):  
Mohamed Barakat ◽  
Abdullah Al-Doss ◽  
Khaled Moustafa ◽  
Mohamed Motawei ◽  
Ibrahim Al-Ashkar ◽  
...  
Keyword(s):  
High Temperature ◽  
Grain Yield ◽  
Temperature Stress ◽  
Grain Filling ◽  
Interval Mapping ◽  
High Temperature Stress ◽  
Temperature Tolerance ◽  
High Temperature Tolerance ◽  
Heat Susceptibility Index ◽  
Grain Filling Period

Stress induced by high temperature represents a major constraint over wheat production in many production areas. Here, the comprehensive coverage of the wheat genome achievable using single nucleotide polymorphism markers was exploited to carry out a genetic analysis targeting yield components in plants exposed to high temperature stress. The mapping population was a set of doubled haploid lines derived from a cross between the cultivars Yecora Rojo and Ksu106. Both of the parental cultivars and their derived population were tested in the field in two locations over two consecutive seasons; at each site, two sowing dates were included, with the later sowing intended to ensure that the plants were exposed to high temperature stress during the grain filling period. Composite interval mapping detected 93 quantitative trait loci influencing grain yield and some related traits, along with 20 loci associated with a ?heat susceptibility index? (HSI). The loci were distributed over all 21 of the wheat chromosomes. Some of these loci were of large enough effect to be considered as candidates for the marker-assisted breeding of high temperature tolerance in wheat.

Assessment of wheat (Triticum aestivum L.) genotypes for high temperature stress tolerance using physico-chemical analysis

2020 ◽  
Vol 53 (2) ◽  
Author(s):  
Khalil Ahmed Laghari ◽  
Abdul Jabbar Pirzada ◽  
Mahboob Ali Sial ◽  
Muhammad Athar Khan ◽  
Jamal Uddin Mangi
Keyword(s):  
Triticum Aestivum ◽  
High Temperature ◽  
Chemical Analysis ◽  
Stress Tolerance ◽  
Temperature Stress ◽  
Triticum Aestivum L ◽  
High Temperature Stress ◽  
Physico Chemical

Agronomic, physiological and molecular characterisation of rice mutants revealed the key role of reactive oxygen species and catalase in high-temperature stress tolerance

2020 ◽  
Vol 47 (5) ◽  
pp. 440 ◽  
Author(s):  
Syed Adeel Zafar ◽  
Amjad Hameed ◽  
Muhammad Ashraf ◽  
Abdus Salam Khan ◽  
Zia-ul- Qamar ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Heat Stress ◽  
High Temperature ◽  
Grain Yield ◽  
Temperature Stress ◽  
Heat Tolerance ◽  
High Temperature Stress ◽  
Oxygen Species ◽  
Selection Indices ◽  
Heat Tolerant

Climatic variations have increased the occurrence of heat stress during critical growth stages, which negatively affects grain yield in rice. Plants adapt to harsh environments, and particularly high-temperature stress, by regulating their physiological and biochemical processes, which are key tolerance mechanisms. The identification of heat-tolerant rice genotypes and reliable selection indices are crucial for rice improvement programs. Here, we evaluated the response of a rice mutant population for high-temperature stress at the seedling and reproductive stages based on agronomic, physiological and molecular indices. Estimates of variance components revealed significant differences (P < 0.001) among genotypes, treatments and their interactions for almost all traits. The principal component analysis showed significant diversity among genotypes and traits under high-temperature stress. The mutant HTT-121 was identified as the most heat-tolerant mutant with higher grain yield, panicle fertility, cell membrane thermo-stability (CMTS) and antioxidant enzyme levels under heat stress. Various seedling-based morpho-physiological traits (leaf fresh weight, relative water contents, malondialdehyde, CMTS) and biochemical traits (superoxide dismutase, catalase and hydrogen peroxide) explained variations in grain yield that could be used as selection indices for heat tolerance in rice during early growth. Notably, heat-sensitive mutants accumulated reactive oxygen species, reduced catalase activity and upregulated OsSRFP1 expression under heat stress, suggesting their key roles in regulating heat tolerance in rice. The heat-tolerant mutants identified in this study could be used in breeding programs and to develop mapping populations to unravel the underlying genetic architecture for heat-stress adaptability.

scholarly journals Determination of the High Temperature Stress Tolerances of Bread Wheat Genotypes

2017 ◽  
Vol 11 (7) ◽  
Author(s):  
Zahit Kayıhan Korkut ◽  
Alpay Balkan ◽  
İsmet Başer ◽  
Oğuz Bilgin
Keyword(s):  
High Temperature ◽  
Bread Wheat ◽  
Temperature Stress ◽  
High Temperature Stress ◽  
Wheat Genotypes

scholarly journals Evaluation of stress indices for screening of rice cultivars for high temperature tolerance

2019 ◽  
Vol 56 (4) ◽  
pp. 341-351
Author(s):  
Veronica N ◽  
Ashoka Rani Y ◽  
Subrahmanyam D ◽  
Narasimha Rao KL ◽  
Lal Ahamad M ◽  
...  
Keyword(s):  
High Temperature ◽  
Grain Yield ◽  
Temperature Stress ◽  
Geometric Mean ◽  
High Temperature Stress ◽  
Temperature Tolerance ◽  
Growing Period ◽  
High Temperature Tolerance ◽  
Severe Reduction ◽  
Stress Susceptibility

High temperature during the crop growing period is detrimental as it results in reduction of yield. A diverse set of rice germplasm consisting of 60 genotypes was grown at two different sowing times (normal and late) and were exposed naturally to high temperature in the late sown condition (stress). There was a severe reduction in grain yield and spikelet fertility in all the genotypes in the late sown crop. Yield based indices were computed based on grain yield recorded under normal and stress conditions. Indices Stress Susceptibility Index (STI), Geometric Mean Production (GMP), Mean Production (MP), Yield Index (YI), Modified stress tolerance (K1STI and K2STI) were positively correlated with yield recorded under both normal and high temperature stress condition and can be considered as suitable indices for screening of rice genotypes under high temperature conditions. Ranking genotypes based on the indices revealed that Rasi, HKR47, IR64, Khudaridhan, Akshayadhan and N22 exhibited the highest mean rank and hence they can be identified as heat-tolerant genotypes. ADT43, Vandana, IR36, MTU1001, ADT49 and Krishnahamsa had a lower rank and were identified as susceptible genotypes to high-temperature stress.

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