Phenotypic diversity among Iranian bread wheat landraces, as a screening tool for drought tolerance

Chaichi, Mehrdad; Sanjarian, Forough; Razavi, Khadijeh; Gonzalez-Hernandez, Jose L.

doi:10.1007/s11738-019-2882-1

Cited by 6 publications

(2 citation statements)

References 51 publications

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“…The sensitivity of the fast fluorescence parameters to drought or osmotic stress has also been identified in barley [18], sorghum [25], rice [26], and maize [27]. There are several studies which have confirmed these findings, including a few studies using field conditions [28,29], but there is still insufficient information on the responses of PSII photochemistry on moderate, slowly progressing drought stress in field conditions and the specific effects of irrigation.…”

Section: Introductionmentioning

confidence: 94%

Chlorophyll Fluorescence Kinetics May Be Useful to Identify Early Drought and Irrigation Effects on Photosynthetic Apparatus in Field-Grown Wheat

et al. 2020

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To assess the reliability and sensitivity of non-invasive optical methods to detect the early effects of water deficit in the field, we analyzed the time-series of non-invasive measurements obtained in a dry season in a representative collection of wheat genotypes grown in small-plot field trials, in non-irrigated and irrigated variants. Despite a progressive water deficit and significant yield loss, the measurements indicated very minor changes in chlorophyll content or canopy cover. This corresponded well to the insignificant differences in spectral reflectance normalized difference vegetation index (NDVI) values. On the other hand, we identified the significant and rapid response of fast fluorescence kinetics data following the onset of irrigation. Analysis of parameters showed the main effects of drought were associated with changes in the amplitude of the I–P phase of the OJIP transient, indicating changes at the level of photosystem I and beyond. Statistical analyses identified the integrative parameter performance index PItot as the most sensitive parameter, which well-reflects the differences in responses of the genotypes to water deficit. Our results suggest that focusing on photosynthetic functions detected by the rapid chlorophyll fluorescence records can provide more accurate information on the drought stress level, compared to the structural data obtained by absorbance or reflectance measurements.

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Section: Introductionmentioning

confidence: 94%

Chlorophyll Fluorescence Kinetics May Be Useful to Identify Early Drought and Irrigation Effects on Photosynthetic Apparatus in Field-Grown Wheat

et al. 2020

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“…Непрямі методи. Оскільки безпосередня оцінка рівня агрономічної стійкості рослин до посухи є тривалим і трудомістким завданням, у селекційній та інтродукційній практиці широко використовують непрямі лабораторні методи оцінки біологічної стійкості за фізіологічними, анатомічними, морфологічними та біохімічними показниками [23, 60,95]. Ці підходи полягають у використанні не самої стійкості до нестачі вологи, а будь-якої іншої біологічної властивості, пов'язаної з даною ознакою.…”

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Methods for evaluation of wheat breeding material for drought tolerance

Pykalo¹,

Demydov²,

Yurchenko³

et al. 2020

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Wheat is one of the most valuable cereals on the planet and plays a leading role in the food supply of mankind. The range of wheat is very large, since it is cultivated on five continents in most countries of the world. The genetic improvement of wheat is crucial because of its direct impact on the economic development, international grain trade and food security of the country, so the relevance of research in solving many genetic-breeding problems regarding this crop is growing and acquires a qualitatively new character. The increase in productivity is the most important criterion in the cultivation of any crops, in particular wheat. Drought is one of the main limiting environmental factors that reduce plant productivity. In order to guarantee agriculture from losses in dry years, it is necessary to have varieties tolerant to moisture deficiency. That is why one of the priority areas of wheat breeding is the creation of varieties tolerant to the action of water deficiency. The success of breeding when creating drought tolerant forms largely depends on the correct assessment of the degree of their tolerance. Conducting research on the assessment of genotypes for tolerance to water stress is one of conditions for increasing efficiency of the breeding process of this culture. The results obtained in the analysis of literature data, found that for screening of wheat varieties for drought tolerance there are many methods based on different principles of action, and each of them has its advantages and disadvantages. To accelerate the breeding process and obtain reliable results, it is necessary to apply various methods of researching samples on specific signs of tolerance to stress. The choice of method largely depends on the degree of its complexity, the duration of the assessment and throughput. Therefore, the creation of new and improvement of existing methods for assessing wheat breeding material for drought tolerance in conditions of increasing water deficit or temperature increase will make it possible to objectively characterize the level of adaptability of promising genotypes and predict their behavior in appropriate environmental conditions.

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