Evaluation of Agronomic Traits and Drought Tolerance of Winter Wheat Accessions from the USDA-ARS National Small Grains Collection

The influence of 24-epibrassinolide (EBR24), applied to leaves at a concentration of 5 μM, on plant physio-biochemistry and its reflection on crop water productivity (CWP) and other agronomic traits of six maize hybrids was field-evaluated under semi-arid conditions. Two levels of irrigation water deficiency (IWD) (moderate and severe droughts; 6000 and 3000 m3 water ha−1, respectively) were applied versus a control (well-watering; 9000 m3 water ha−1). IWD reduced the relative water content, membrane stability index, photosynthetic efficiency, stomatal conductance, and rates of transpiration and net photosynthesis. Conversely, antioxidant enzyme activities and osmolyte contents were significantly increased as a result of the increased malondialdehyde content and electrolyte leakage compared to the control. These negative influences of IWD led to a reduction in CWP and grain yield-related traits. However, EBR24 detoxified the IWD stress effects and enhanced all the above-mentioned parameters. The evaluated hybrids varied in drought tolerance; Giza-168 was the best under moderate drought, while Fine-276 was the best under severe drought. Under IWD, certain physiological traits exhibited a highly positive association with yield and yield-contributing traits or CWP. Thus, exogenously using EBR24 for these hybrids could be an effective approach to improve plant and water productivity under reduced available water in semi-arid environments.

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miR2105 regulates ABA biosynthesis via OsbZIP86-OsNCED3 module to contribute to drought tolerance in rice

10.1101/2021.09.21.461241 ◽

2021 ◽

Author(s):

Weiwei Gao ◽

Mingkang Li ◽

Songguang Yang ◽

Chunzhi Gao ◽

Yan Su ◽

...

Keyword(s):

Drought Stress ◽

Drought Tolerance ◽

Transgenic Rice ◽

Crucial Role ◽

Agronomic Traits ◽

Stomatal Closure ◽

Plant Tolerance ◽

Rice Plants ◽

Transgenic Rice Plants ◽

Aba Biosynthesis

AbstractInduced abscisic acid (ABA) biosynthesis plays an important role in plant tolerance to abiotic stresses, including drought, cold and salinity. However, regulation pathway of the ABA biosynthesis in response to stresses is unclear. Here, we identified a rice miRNA, osa-miR2105 (miR2105), which plays a crucial role in ABA biosynthesis under drought stress. Analysis of expression, transgenic rice and cleavage site showed that OsbZIP86 is a target gene of miR2105. Subcellular localization and luciferase activity assays showed that OsbZIP86 is a nuclear transcription factor. In vivo and in vitro analyses showed that OsbZIP86 directly binds to the promoter of OsNCED3, and interacts with OsSAPK10, resulting in enhanced-expression of OsNCED3. Transgenic rice plants with knock-down of miR2105 or overexpression of OsbZIP86 showed higher ABA content, more tolerance to drought, a lower rate of water loss, more stomatal closure than wild type rice ZH11 under drought stress. These rice plants showed no penalty with respect to agronomic traits under normal conditions. By contrast, transgenic rice plants with miR2105 overexpression, OsbZIP86 downregulation, or OsbZIP86 knockout displayed less tolerance to drought stress and other phenotypes. Collectively, our results show that a regulatory network of ‘miR2105-OsSAPK10/OsbZIP86-OsNCED3’ control ABA biosynthesis in response to drought stress.One-sentence summary‘miR2105-OsbZIP86-OsNCED3’ module plays crucial role in mediating ABA biosynthesis to contribute to drought tolerance with no penalty with respect to agronomic traits under normal conditions.

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Genetic Improvement in Agronomic Traits of Hard Red Winter Wheat Cultivars 1919 to 1987

Crop Science ◽

10.2135/cropsci1988.0011183x002800050006x ◽

1988 ◽

Vol 28 (5) ◽

pp. 756-760 ◽

Cited By ~ 138

Author(s):

T. S. Cox ◽

J. P. Shroyer ◽

Liu Ben‐Hui ◽

R. G. Sears ◽

T. J. Martin

Keyword(s):

Winter Wheat ◽

Genetic Improvement ◽

Agronomic Traits ◽

Wheat Cultivars ◽

Hard Red Winter Wheat ◽

Winter Wheat Cultivars ◽

Red Winter Wheat

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Affordable Phenotyping of Winter Wheat under Field and Controlled Conditions for Drought Tolerance

Agronomy ◽

10.3390/agronomy10060882 ◽

2020 ◽

Vol 10 (6) ◽

pp. 882

Author(s):

Dhananjay Kumar ◽

Sandeep Kushwaha ◽

Chiara Delvento ◽

Žilvinas Liatukas ◽

Vivekanand Vivekanand ◽

...

Keyword(s):

Drought Tolerance ◽

Winter Wheat ◽

Growth Rates ◽

Plant Biomass ◽

Growth Conditions ◽

Seedling Stage ◽

Growth Stages ◽

Digital Cameras ◽

Relative Growth ◽

Relative Growth Rates

Drought stress is one of the key plant stresses reducing grain yield in cereal crops worldwide. Although it is not a breeding target in Northern Europe, the changing climate and the drought of 2018 have increased its significance in the region. A key challenge, therefore, is to identify novel germplasm with higher drought tolerance, a task that will require continuous characterization of a large number of genotypes. The aim of this work was to assess if phenotyping systems with low-cost consumer-grade digital cameras can be used to characterize germplasm for drought tolerance. To achieve this goal, we built a proximal phenotyping cart mounted with digital cameras and evaluated it by characterizing 142 winter wheat genotypes for drought tolerance under field conditions. The same genotypes were additionally characterized for seedling stage traits by imaging under controlled growth conditions. The analysis revealed that under field conditions, plant biomass, relative growth rates, and Normalized Difference Vegetation Index (NDVI) from different growth stages estimated by imaging were significantly correlated to drought tolerance. Under controlled growth conditions, root count at the seedling stage evaluated by imaging was significantly correlated to adult plant drought tolerance observed in the field. Random forest models were trained by integrating measurements from field and controlled conditions and revealed that plant biomass and relative growth rates at key plant growth stages are important predictors of drought tolerance. Thus, based on the results, it can be concluded that the consumer-grade cameras can be key components of affordable automated phenotyping systems to accelerate pre-breeding for drought tolerance.

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Effect of drought stress and drought tolerance heredity on nitrogen efficiency of winter wheat

Plant Nutrition ◽

10.1007/0-306-47624-x_29 ◽

2001 ◽

pp. 62-63 ◽

Cited By ~ 7

Author(s):

X. L. Fan ◽

Y. K. Li

Keyword(s):

Drought Stress ◽

Drought Tolerance ◽

Winter Wheat ◽

Nitrogen Efficiency

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Vernalization Response of Some Winter Wheat Cultivars (Triticum aestivum L.)

Czech Journal of Genetics and Plant Breeding ◽

10.17221/6242-cjgpb ◽

2012 ◽

Vol 38 (No. 3-4) ◽

pp. 97-103 ◽

Cited By ~ 3

Author(s):

J. Košner ◽

K. Pánková

Keyword(s):

Triticum Aestivum ◽

Winter Wheat ◽

Agronomic Traits ◽

Triticum Aestivum L ◽

Vernalization Requirement ◽

Photoperiod Response ◽

Vernalization Response ◽

Multiple Alleles ◽

Winter Wheat Cultivars ◽

The Given

For 17 cultivars of winter wheat (Triticum aestivum L.) different vernalization and photoperiod responses were detected. The effect of photoperiod sensitivity was not significantly changed by vernalization; different vernalization responses were probably due to the presence of multiple alleles at Vrn loci. The delay in heading depended on the vernalization deficit exponentially: y = Parameter (1) + (y0 – Parameter (1)) × EXP (Parameter (2) × (x – x0)). The dependence was shown to be general and significant for the given model in all the studied cultivars. Individual regressions characterised responses of cultivars to a deficit of vernalization treatment. Cluster analysis according to the characterisation obtained (full vernalization requirement, minimum vernalization requirement, insufficient vernalization and parameters of the dependence) showed the relationships between cultivars and enabled their grouping by similar profiles of vernalization, and, possibly, of photoperiod response. In individual cultivars, an attempt was made to use the model to predict performance for some agronomic traits.

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Relation of grain protein content and some agronomic traits in European cultivars of winter wheat

Cereal Research Communications ◽

10.1556/crc.40.2012.0004 ◽

2012 ◽

Vol 40 (4) ◽

pp. 532-541 ◽

Cited By ~ 3

Author(s):

V. Mladenov ◽

B. Banjac ◽

A. Krishna ◽

M. Milošević

Keyword(s):

Winter Wheat ◽

Protein Content ◽

Agronomic Traits ◽

Grain Protein Content ◽

Grain Protein

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Screening for Drought Tolerance in Thirty Three Taro Cultivars

Notulae Botanicae Horti Agrobotanici Cluj-Napoca ◽

10.15835/nbha46110950 ◽

2018 ◽

Vol 46 (1) ◽

pp. 65-74 ◽

Cited By ~ 8

Author(s):

José F.T. GANANÇA ◽

José G.R. FREITAS ◽

Humberto G.M. NÓBREGA ◽

Vanessa RODRIGUES ◽

Gonçalo ANTUNES ◽

...

Keyword(s):

Drought Tolerance ◽

Agronomic Traits ◽

Yield Stability ◽

Yield Potential ◽

High Yield ◽

Potential Yield ◽

Local Cultivars ◽

Drought Avoidance ◽

Drought Tolerant ◽

Long Duration

Taro [Colocasia esculenta (L.) Schott] is a root crop which is an important staple food in many regions of the world, producing 10.5 million tonnes on 1.4 million hectares a year. The crop is cultivated in wet (rain fed) or irrigated conditions, requiring on average 2,500 mm water per year, and in many countries it is cultivated in flooded plots. It is estimated that taro production could decrease by 40% as a result of the increase in drought and other severe events. In this work, thirty three accessions, including local cultivars, selected and hybrid lines were submitted to long duration drought stress and screened for tolerance. Twelve physiological, morphological and agronomic traits were measured at harvest, and subject to multivariate analysis. Stress indices, Water Use Efficiency and Factorial Analysis were useful for discriminating accessions regarding drought tolerance and yield stability, and drought tolerant and susceptible cultivars were identified. Our results confirm that different taro cultivars have different drought avoidance and tolerance strategies to cope with water scarcity. Better yield performers minimised biomass and canopy loss, while tolerance was observed in cultivars that presented low potential yield, but efficiently transferred resources to enhance corm formation. Among the 33 accessions, two local cultivars showed high yield stability and could be considered as suitable parents for breeding programs, while two others are well adapted to drought, but with overall low yield potential.

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