بررسی تنوع ویژگی‌های ریشه در لاین‌های نخود (Cicer arietinum L.)

شکری, زهرا; طهماسبی, زهرا; کانونی, همایون; مهرابی, علی اشرف

IntroductionChickpea is the third most important grain legume and its seeds contain protein that is an important energy source for human. Drought diminishes crop yields and carries the potential to result in total crop failure. However, chickpeas are renowned for their sufaior drought tolerance compared to many other cool-season legumes. Given that water availability is the primary constraint on growth in arid conditions, optimal yields and crop production occur when plants efficiently absorb the limited soil moisture available. This feature will only be achieved through the compatibility mechanisms associated with the root system. Chickpea have a direct and deep root system that helps the plant absorb moisture from the lower layers of the soil. Therefore it has led to the prosfaity of its cultivation in rainfed areas. Water absorption by the plant depends on the size of the root, its activity and distribution in the soil. Therefore, it seems that the understanding of plant root traits is necessary to further understand the mechanisms of drought resistance. In general, few studies have been done on the diversity of legume roots. Therefore, this research was carried out with the aim of investigating the diversity of root morphological traits of chickpea lines in order to use these traits to select drought-tolerant chickpea lines. Materials and MethodsThe plant materials of this exfaiment included 39 chickpea lines of Icarda origin, which were taken from the Kurdistan Research Center. The exfaiment was conducted as a completely randomized design with four replications in the research greenhouse of Ilam University. Seeds were implanted in PVC tubes with a diameter of 10 cm and a lenth of 60 cm. A drip irrigation system was designed in such a way that an emitter was located inside each tube. With this method, the test tubes were in favorable conditions. In the greenhouse the temfaature was under control and had a temfaature of 25 degrees Celsius and an average humidity of 70% and the plants used natural light without any additional light. After 35 days of seed germination traits were measured. For this purpose, first the aerial parts of the plant were separated by scissors. After separating the roots from the PVC tubes, they were placed in ethanol with a concentration of 98% and after being transferred to the laboratory, they were stored in the refrigerator, then the traits were measured. Variance analysis of traits and average comparison of data was done with Duncans multi-range test using SAS software version 9.1. Results and DiscussionAll the measured traits had a good variation range among the studied chickpea lines that these results are consistent with previous studies. None of the lines showed sufaiority for all root traits. Line FLIP07-20C having the longest root lenth, can benefit from the water available in a larger volume of the soil profile. In the examination of rooting depth in grain legumes, such as chickpeas, it was observed that root lenth remains relatively stable across a broad spectrum of soil moisture levels. Root lenth is considered a crucial parameter in plant growth, as researchers posit that the lenth of roots fa unit of soil volume is the most effective characteristic for assessing water and nutrient absorption by plants. In our current investigation, a significant disparity was noted between the highest and lowest root volumes. Root volume stands out as one of the plant's key attributes for absorbing water and nutrients. In this research, line FLIP 82-150C had the highest and line FLIP97-706C had the lowest specific root lenth. The specific root lenth is one of the important traits in showing the efficiency of the root in absorbing water and resistance to drought. When faced with drought stress, the plant assigns more dry matter to the root system in order to increase the absorption ability of the roots; as a result, there are changes in the morphological characteristics of the roots, such as an increase in the specific lenth of the root. The highest root density was observed in line FLIP09-149C. root density is a trait that is affected by root weight and volume. In the condition of drought stress, the decrease in root volume caused an increase in root density and at the end of the growth faiod, the decrease in root dry weight was more than the decrease in its volume, which ultimately led to a decrease in root density. Studies have indicated that as humidity decreases and soil depth increases, there is a notable decrease in root density. Overall, the findings from this research offer foundational insights for advancing efforts to enhance root characteristics, thereby mitigating drought and enhancing the resilience of chickpea varieties to drought stress. ConclusionsThe results showed that Line FLIP07-20C had the highest root lenth, root lenth density and root water content compared to other lines, but none of the lines were sufaior in terms of all root traits. The obtained information about the characteristics of the roots of the studied lines can be used to improve drought-resistant chickpea lines.

Iranian Journal of Pulses Research, 2024, Vol 15, Issue 1, p23

2980-793X

Academic Journal

10.22067/ijpr.2024.80655.1051