Alaa A. Said, Salah F. Abou‐Elwafa, Abdel‐Rahman A. Mustafa, Ahmed R. M. Ridwan, Mohamed A. Siddiq, Ali R. A. Moursy, Mohamed A. E. AbdelRahman, Nafisa A. M. Mobarak
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引用次数: 0
Abstract
The major problem in the cultivation of sorghum in the Egyptian agricultural system includes arid climate and water shortage. Thus, the present study was undertaken to investigate the effect of drought conditions on the productivity of 21 different sorghum (Sorghum bicolor L.) genotypes at Sohag, Egypt. A set of drought tolerance metrics employed in the present study were Tolerance Index (TOL); Mean Production (MP); Sensitivity to Drought Index (SSI); Stress Tolerance Index (STI); Geometric mean performance (GMP) and Harmonic mean of yield (HARM). A field‐controlled experiment was conducted on the two growth seasons (2021 and 2022) concerning the impact of different drought levels on (ET0 = 0.8, 0.6 and 0.4) Grain Yields (GY) and Water Use Efficiency (WUE) for the various studied sorghum genotypes. Principal Component Analysis (PCA) was also conducted on the obtained data of the different yield parameters with the aim of identifying the most effective tolerance indices related to the different genotypes of sorghum under both conditions, optimal and stressed. Drought tolerance varies among different sorghum varieties, which, by their genetic and physiological nature, possess efficient stomatal regulation and deep‐rooted systems, enhancing water conservation and physiological functions and hence higher WUE. These are mainly influenced by environmental conditions, such as soil type and moisture levels in the region of Sohag, where such genotypes may exhibit different performances regarding drought stress. It was observed that Giza‐15 and Hybrid Sh1 were among the high performers under well‐irrigated conditions, and L38 was outstanding during a severe drought in terms of WUE. Therefore, proper genotype selection depends on the irrigation strategy. Hence, the Sohag region presents a good opportunity for further improvement of drought tolerance through designed selection and hybridization activities in sorghum breeders, and this contributes to climate‐resilient cultivars by addressing the present agricultural challenges and food security for the present world. Emphasis will be placed by breeders on the development of arid‐condition‐adapted genotypes and the development of models that can be applied within comparable climates to boost productivity and sustainability for those farmers dependent on this vital crop.
期刊介绍：
The effects of stress on crop production of agricultural cultivated plants will grow to paramount importance in the 21st century, and the Journal of Agronomy and Crop Science aims to assist in understanding these challenges. In this context, stress refers to extreme conditions under which crops and forages grow. The journal publishes original papers and reviews on the general and special science of abiotic plant stress. Specific topics include: drought, including water-use efficiency, such as salinity, alkaline and acidic stress, extreme temperatures since heat, cold and chilling stress limit the cultivation of crops, flooding and oxidative stress, and means of restricting them. Special attention is on research which have the topic of narrowing the yield gap. The Journal will give preference to field research and studies on plant stress highlighting these subsections. Particular regard is given to application-oriented basic research and applied research. The application of the scientific principles of agricultural crop experimentation is an essential prerequisite for the publication. Studies based on field experiments must show that they have been repeated (at least three times) on the same organism or have been conducted on several different varieties.
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