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Physiological traits and yield of three soybean (Glycine max (L.) Merr.) genotypes as affected by water deficiency
| Content Provider | Semantic Scholar |
|---|---|
| Author | Basal, Oqba Szabó, András |
| Copyright Year | 2018 |
| Abstract | Soybean (Glycine max (L.) Merr.) is a very important crop for both human consumption and animal feeding because of its high content of protein and oil (Liu et al. 2008). Compared to other legumes, soybean seeds have the highest protein concentration, and are one of the highest in oil concentration, they also contain carbohydrates, minerals and other components (Miransari 2016). Soybean is mostly sown under rainfed conditions, and the current global climatic changes have put this crop under many abiotic stresses with drought stress being the most influencing hazard, because soybean is known to be drought-susceptible crop (Liu et al. 2004, Oh and Komatsu 2015). Drought restrains soybean growth and leads to yield reduction by around 40% (Manavalan et al. 2009). Moreover, Ishibashia et al. (2011) reported that flowering stage is the most sensitive to drought stress; Ohashi et al. (2006) recorded 20% yield reduction when soybean was subjected to drought stress during the vegetative stages, whereas the reduction reached about 46% in the flowering stage; similar results were introduced by Cui et al. (2013). Turner et al. (2005) reported yield reduction by 20% under drought conditions during seed filling. Many physiological changes in soybean plants occur as a result of drought stress; these changes lead to growing and development conflictions (Reynolds and Tuberosa 2008). The leaf area index (LAI) is the canopy density of a crop population, and has an important effect on the final yield (Liu et al. 2008). Dong et al. (1979) reported a positive correlation of (LAI) with grain yield of eight cultivars; however, each cultivar had a different leaf size, leaf shape and leaf development (Chang 1981). Shading happens to the lower leaf levels and consequently reduces the (LAI), but still, drought stress decreases the (LAI) more than mutual shading does (Liu et al. 2008). Chlorophyll content is one of the most important physiological traits, as it reflects the potentials of plant photosynthesis, and consequently, the yield potential. Drought stress influences the chlorophyll content and reduces its value as presented by many researchers; Makbul et al. (2011) recorded significant reduction in chlorophyll content by 28% in drought-stressed soybean, whereas Hao et al. (2013) found it to be 31% compared to control plants. Similar results were previously provided by Atti et al. (2004). Plant height shows the ability of the soybean plants to produce more nodes, and consequently more flowers, pods and seeds. Navari-Izzo et al. (1990) reported a reduction by 4.3% of soybean seedling height when subjected to drought stress; later, other papers reported similar conclusions at different stages of soybean lifecycle (Atti et al. 2004, Hao et al. 2013, Mak et al. 2014). It is normal, taking into consideration the abovementioned traits, that the final seed yield will be affected by drought stress; all the previous studies on soybean, under water deficit, reported significant yield loss (e.g. Sadeghipour and Abbasi 2012, Li et al. 2013) regardless of the stage when the drought stress was applied (for example, during pod formation (Sionit and Kramer 1977), or during seed filling (Maleki et al. 2013). The different soybean genotypes were reported to show different yield reductions under drought stress conditions (Bellaloui and Mengistu 2008, He et al. 2016). The aim of this paper was to study the changes in chlorophyll content, leaf area index, plant height and yield of three different soybean genotypes under certain drought stress conditions. |
| Starting Page | 11 |
| Ending Page | 15 |
| Page Count | 5 |
| File Format | PDF HTM / HTML |
| DOI | 10.34101/actaagrar/74/1658 |
| Alternate Webpage(s) | https://ojs.lib.unideb.hu/actaagrar/article/download/1658/2287 |
| Alternate Webpage(s) | https://doi.org/10.34101/actaagrar%2F74%2F1658 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
