Genetic variation in drought tolerance at seedling stage and grain yield in low rainfall environments in wheat (Triticum aestivum L.)

Sallam, Ahmed; Mourad, Amira M. I.; Hussain, Waseem; Baenziger, P. S.

doi:10.1007/s10681-018-2245-9

Cited by 51 publications

(83 citation statements)

References 47 publications

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“…Qualitative trait loci for seedling traits that co-localize with yield-QTL provide valuable evidence regarding the implications of seedling variability at the early stage for subsequent field performance. Moreover, all phenotypic traits at the seedling stage can be rapidly and reliably measured for screening large numbers of genotypes (Wang et al, 2015b;Sallam et al, 2018). Sallam et al (2018) found that the most resistant genotypes at the seedling stage in a greenhouse were also among the highest yielding genotypes in low rainfall environments.…”

Section: Implications Of Seedling Variability At An Early Stage For Fmentioning

confidence: 99%

“…Moreover, all phenotypic traits at the seedling stage can be rapidly and reliably measured for screening large numbers of genotypes (Wang et al, 2015b;Sallam et al, 2018). Sallam et al (2018) found that the most resistant genotypes at the seedling stage in a greenhouse were also among the highest yielding genotypes in low rainfall environments. The selected genotypes at the seedling stage can be integrated into the breeding program to improve drought resistance in wheat (Sallam et al, 2018).…”

Section: Implications Of Seedling Variability At An Early Stage For Fmentioning

confidence: 99%

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Dissection of Phenotypic and Genetic Variation of Drought‐Related Traits in Diverse Chinese Wheat Landraces

Lin

Tang

et al. 2019

The Plant Genome

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The Plant Genome W heat (Triticum aestivum L.) which originated in the Fertile Crescent has been domesticated for some 10,000 yr (Lev-Yadun et al., 2000). Currently, wheat is one of the most widely planted crops, supplying approximately 30% of the human population. Although wheat is mainly grown on rainfed land, approximately 37% of the cropping area in developing countries consists of semiarid environments, where drought imposes a primary constraint on wheat production (Qayyum et al., 2011; Sadok, 2017; Sinclair, 2011). As the climate continues to change, drought is predicted to become more severe and more widely distributed, and thus will probably further limit crop growth and reduce yields (

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Section: Implications Of Seedling Variability At An Early Stage For Fmentioning

confidence: 99%

Section: Implications Of Seedling Variability At An Early Stage For Fmentioning

confidence: 99%

Dissection of Phenotypic and Genetic Variation of Drought‐Related Traits in Diverse Chinese Wheat Landraces

Lin

Tang

et al. 2019

The Plant Genome

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“…Therefore, the stage at which genotypes are screened for drought tolerance should be carefully considered. For instance, improving a survival trait under drought conditions at the seedling stage may be appropriate if the drought stress occurs during seedling growth and development (Sallam et al 2018). In the last 10 years, low rainfall has been noted in Egypt during the planting period, October to March, which coincides with the seedling stage of cultivated wheat (Sallam et al 2018).…”

Section: Introductionmentioning

confidence: 99%

“…For instance, improving a survival trait under drought conditions at the seedling stage may be appropriate if the drought stress occurs during seedling growth and development (Sallam et al 2018). In the last 10 years, low rainfall has been noted in Egypt during the planting period, October to March, which coincides with the seedling stage of cultivated wheat (Sallam et al 2018). Early drought is a major constraint for cultivating the wheat crop in the semi-arid region that results in weak seedlings and poor development and might lead to a complete crop failure with minor ultimate yield under severe drought.…”

Section: Introductionmentioning

confidence: 99%

Effect of Exogenously Applied Jasmonic Acid and Kinetin on Drought Tolerance of Wheat Cultivars Based on Morpho-Physiological Evaluation

Abeed

Eissa

Abdel-Wahab

2020

J Soil Sci Plant Nutr

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The population acceleration and better lifestyle submit new challenges for wheat researchers to breed wheat (Triticum sativum) cultivars with upgraded yield, quality, and resistance against abiotic stresses such as drought, so exploiting all available natural relatives of cultivated wheat and introducing even sensitive ones may be a useful approach to save time and efforts. Normally, the seedling stage is highly drought vulnerable, but for sensitive cultivars, the situation is more frustrating. We examine the potentiality of two regulating hormones in the upregulation of two wheat cultivars varying in their drought susceptibility at the seedling stage comparatively evaluated by morpho-physiological traits as indicators of drought tolerance. All the studied traits revealed cultivardependent variation in response to water deficit where cv. Sids 1 was tolerant and cv. Beni-suef 5 was sensitive. Shoot/root ratio, total water content, total dry weight, chlorophyll stability, total osmotic potential, osmoregulatory components, viz., soluble carbohydrates, soluble proteins and proline, membrane damage trait in terms of LOX, antioxidant defense system enzymatically in terms of APX, CAT, POD, SOD, and total antioxidant as drought tolerance indicators were the troubling shot due to water shortage in both cultivars. The damaging impacts of water deficit on these traits were conceived for sensitive cultivar compared with the tolerant one. Exogenous application of jasmonic acid (JA) or kinetin (K) efficiently conferred drought tolerance to sensitive cultivar to withstand harsh conditions in earlier stages and to perform comparably with tolerant ones. Applied hormones prompted unequivocal inversion from a state of downregulation to upregulation regarding all drought tolerance traits via reallocation of photoassimilates to vegetative sinks, thus promoting growth, increasing the accumulation of some osmoregulation compounds and thus increased tissue vigor and regulated the activity of antioxidant enzymes as well as morphological modulation attained by the restoration of shoot/root ratio. The results would promisingly be supportive of research programs seeking to develop antidrought stress practices for sensitive wheat cultivars.

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“…Considering more than a trait to determine the most promising genotypes are highly recommended in the selection process. Selection of the most promising genotypes based on multiple traits was also reported in wheat (Sallam et al 2018) and faba bean (Sallam et al 2017). The most ve drought tolerant genotypes were characterized before as drought tolerant.…”

Section: Discussionmentioning

confidence: 92%

Utilize of genetic diversity and marker-trait association to improve drought tolerance in rice (Oryza sativa L.)

Sallam

2020

Preprint

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Drought stress in one of the main problems for rice crop as it reduces the production and productivity of the grain yield significantly. In Egypt, many restrictions were made on the cultivation of rice due to its high water demand. Producing promising drought-tolerant rice cultivars in a combination with high yielding is one of the main targets for rice breeders. To address this challenge, a set of 22 highly diverse rice genotypes were evaluated under normal and drought conditions. Morphological, physiological, yield traits were recorded on each genotype. Drought susceptibility index (DSI) was estimated for six yield traits to identify the most drought-tolerant rice genotypes. High genetic variation was found among genotypes tested in the experiment. Under normal conditions, the highest phenotypic correlation was found between grain yield (GY) and sterility percentage (SP) (- 0.73**), while, it was among GY and chlorophyll content (CC) (0.82**) under drought conditions. To identify quantitative trait loci (QTL) controlling yielding traits under drought and normal, single marker analysis was performed between all yield traits under both condition and a set of 106 simple sequence repeat (SSR) marker alleles. The genetic association analysis revealed 14 and 17 QTL under drought and normal conditions, respectively. The most drought-tolerant genotypes were selected based on DSI, the number of QTL in each selected genotypes, and the level of genetic diversity. As a result, five genotypes (Giza 178, IET1444, GZ1368-S-5-4, Nahda, Giza 14) were identified as the most promising drought-tolerant rice genotypes. Eight QTL controlling drought tolerance were identified in Giza 178, Nahda, and GZ1368-S-5-4, while, four QTL were found in IET1444. The number of different QTLs were estimated among the five selected genotypes. Giza 178 and GZ1368-S-5-4 shared the same QTLs. Seven different QTLs were found among Nahda, IET1444, GZ1368-S-5-4, and Giza 14. Combining information from phenotypic traits, genetic diversity analysis, and QTL identification was very useful in identifying the true drought-tolerant rice genotypes that can be used for crossing in the future breeding program.

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Genetic variation in drought tolerance at seedling stage and grain yield in low rainfall environments in wheat (Triticum aestivum L.)

Cited by 51 publications

References 47 publications

Dissection of Phenotypic and Genetic Variation of Drought‐Related Traits in Diverse Chinese Wheat Landraces

Dissection of Phenotypic and Genetic Variation of Drought‐Related Traits in Diverse Chinese Wheat Landraces

Effect of Exogenously Applied Jasmonic Acid and Kinetin on Drought Tolerance of Wheat Cultivars Based on Morpho-Physiological Evaluation

Utilize of genetic diversity and marker-trait association to improve drought tolerance in rice (Oryza sativa L.)

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