Predicted and Actual Gain from Selection for Early Maturing and High Yielding Wheat Genotypes Under Water Stress Conditions

2012 ◽  
Vol 16 (3) ◽  
pp. 73-92 ◽  
Author(s):  
A. M. M. Al-Naggar ◽  
M. T. Shehab-Eldeen
Keyword(s):  
Water Stress ◽  
Stress Conditions ◽  
Wheat Genotypes ◽  
Early Maturing ◽  
Selection For ◽  
Actual Gain

The Performance of Ten Bread Wheat Genotypes Associated with Yield and Yield Components under Water Stress Conditions

2014 ◽  
Vol 18 (3) ◽  
pp. 415-428
Author(s):  
E. M. S. Gheith ◽  
M. A. Abd El-Shafi ◽  
A. A. Abd El-Mohsen ◽  
H. S. Suleiman
Keyword(s):  
Water Stress ◽  
Bread Wheat ◽  
Yield Components ◽  
Stress Conditions ◽  
Wheat Genotypes ◽  
Yield And Yield Components

scholarly journals Evaluation of Bread Wheat (Triticum aestivum L.) Genotypes for Drought Tolerance through Selection Indices

2019 ◽  
Vol 7 ◽  
pp. 40-52
Author(s):  
Jawed Aslam Khyber ◽  
Faiza Soomro ◽  
Wahid Dino Sipio ◽  
Abdul Wahid Baloch ◽  
Jay Kumar Soothar ◽  
...  
Keyword(s):  
Water Stress ◽  
Drought Stress ◽  
Grain Yield ◽  
Bread Wheat ◽  
Flag Leaf ◽  
Stress Conditions ◽  
Tolerance Index ◽  
Yield Traits ◽  
Wheat Genotypes ◽  
Drought Tolerant

The current study was planned to identify drought tolerant bread wheat genotypes based on physiological and yield traits. In this context, a set of 12 genotypes (Sarsabz, NIA-Sundar, NIA-Amber, Sassui, Khirman, Marvi-2000, NIA-Sarang, Kiran-95, NIA-Sunheri, Bhittai, Bathoor-08 and Tatara) were evaluated under normal and water stress conditions. Mean squares from analysis of variance exhibited that genotypes, treatments and genotype x treatment interaction showed significant differences (P<0.05) for majority of the studied traits, indicating that there is significant variations are existed for physio-yield traits; therefore these genotypes may be preferred for further breeding programs in respect to drought stress. Regarding reduction percentage of genotypes under drought stress against normal water conditions, the minimum reduction was observed in Bathoor-08 for spike length and flag leaf area, Kiran-95 for grain yield plant, NIA-Sundar for seed index, Marvi-2000 for relative water content, Sarsabz for grains spike, whereas maximum but desirable reduction of stomatal dimension and density was displayed by Sarsabz and Tatara under water stress conditions, respectively. On the basis of drought tolerant indices, the genotypes Kiran-95, NIA-Sundar and Sarsabz showed lower values for tolerance index (TOL), trait stability index (TSI) and stress susceptibility (SSI), nevertheless it is believed that lower values of these indices show the less reduction in yield and its related traits due to water stress conditions hence can be tagged as tolerant genotypes for drought. Correlation results revealed that MP, SSI, TOL and TSI indices were correlated with grain yield under two conditions and they can be the appropriate indices for screening wheat genotypes.

scholarly journals Gram Yield and Yield Components of Spring Wheat Genotypes at Different Moisture Regimes

1998 ◽  
Vol 3 (2) ◽  
pp. 13
Author(s):  
R. Ahmad ◽  
N. Ahmad ◽  
J.C. Stark ◽  
A. Tanveer
Keyword(s):  
Water Stress ◽  
Grain Yield ◽  
Spring Wheat ◽  
Yield Components ◽  
Irrigation System ◽  
Stress Conditions ◽  
High Plasticity ◽  
Wheat Genotypes ◽  
Yield And Yield Components ◽  
High Yields

Yield and developmental characteristics of crop genotypes grown at different levels of water availability are often used to select genotypes that are adapted to variable moisture environments. Field studies were conducted at Aberdeen. Idaho, USA in 1992 and 1993 to evaluate the effects of varying moisture supply on grain yield and yield components of spring wheat genotypes. In both years, 12 spring wheat (Triticum aestivum L.) genotypes were grown under three irrigation levels (well-watered. moderate water-stress and severe water-stress) imposed during the periods from mid-tillering to anthesis with a line source sprinkler irrigation system. Grain yield and yield components (spikes m-2, spikelets spike-1, kernels spikelet-1,  kernels spike-1, and kernel weight) were used to evaluate the genotypic response to water stress. Overall, water stress caused a reduction in grain yield and yield components. Genotypes exhibited a large year-to-year variation in their ranks for grain yield. Medium-tall growing genotypes (IDO 367. lDO 369 and Rick) generally produced high yields under water stress conditions in 1992 (relatively dry year), while short -medium genotypes (WPB 926. Yecora Rojo and Pondera) produced high yields under water stress conditions in 1993 (relatively wet year). Chris and Serra were the lowest yielding genotypes under water stress conditions in both years. Under moderate stress conditions. 100 367 and Yecora Rojo had consistently high yields. Genotypic yield differences under water stress conditions were primarily related to the differences in the numbers of spikes m". Therefore, a tendency for high plasticity for Spikes per unit area could be used to select wheat genotypes for improved drought tolerance.

Variation in water use and transpiration efficiency among durum wheat genotypes grown under moisture stress and non-stress conditions

2003 ◽  
Vol 141 (1) ◽  
pp. 31-41 ◽  
Author(s):  
K. F. SOLOMON ◽  
M. T. LABUSCHAGNE
Keyword(s):  
Grain Yield ◽  
Durum Wheat ◽  
Water Use ◽  
Harvest Index ◽  
Moisture Stress ◽  
Stress Conditions ◽  
Transpiration Efficiency ◽  
High Positive Correlation ◽  
Wheat Genotypes ◽  
Selection For

Durum wheat genotypes with different responses to moisture stress were studied in a glasshouse under moisture stress and non-stress conditions to investigate differences in water use and transpiration efficiency and interrelationships among water use and transpiration efficiency and associated traits. Significantly high genotypic variability in the cumulative amount of water used before (ETba) and after (ETpa) anthesis was observed. Susceptible genotypes used higher amounts of water before anthesis and lower amounts after anthesis. In contrast, tolerant genotypes used a higher proportion of water during the post-anthesis period. Significantly high variability among the genotypes was observed for various measures of water use and transpiration efficiency, total dry matter and harvest index. Ranking of cultivars for water use efficiency based on grain yield (WUEG) and transpiration efficiency based on grain yield was consistent with ranking of cultivars for drought susceptibility indices. Drought susceptibility index was significantly but negatively correlated with harvest index, WUEG and grain yield. However, it was positively and significantly correlated with the ETba[ratio ]ETpa ratio. A high positive correlation of WUEG with harvest index and grain yield with harvest index was found. It was concluded that selection for lower ETba[ratio ]ETpa ratios up to about 0·8 could indirectly lead to improved WUEG and HI, hence improved grain yield. Selection for increased WUEG and/or grain yield would increase yield in water-limited environments.

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