Islam Md Jahirul, Kim Ji Woong, Begum Mst Kohinoor, Sohel Md Abu Taher, Lim Young-Seok
Department of Bio-Health Convergence, Kangwon National University, Chuncheon 24341, Korea.
Physiology and Sugar Chemistry Division, Bangladesh Sugarcrop Research Institute, Ishurdi 6620, Pabna, Bangladesh.
Plants (Basel). 2020 Nov 7;9(11):1511. doi: 10.3390/plants9111511.
The present study was conducted to examine the adaptability of 11 sugar beet cultivars grown under drought stress in the controlled glasshouse. The treatment was initiated on 30-day-old sugar beet plants where drought stress was made withholding water supply for consecutive 10 days while control was done with providing water as per requirement. It was observed that drought stress expressively reduced plant growth, photosynthetic pigments, and photosynthetic quantum yield in all the cultivars but comparative better results were observed in S1 (MAXIMELLA), S2 (HELENIKA), S6 (RECODDINA), S8 (SV2347), and S11 (BSRI Sugarbeet 2) cultivars. Besides, osmolytes like proline, glycine betaine, total soluble carbohydrate, total soluble sugar, total polyphenol, total flavonoid, and DPPH free radical scavenging activity were remarkably increased under drought condition in MAXIMELLA, HELENIKA, TERRANOVA, GREGOIA, SV2348, and BSRI Sugar beet 2 cultivars. In contrast, activities of enzymes like superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) were significantly decreased in all, while the cultivars SV2347, BSRI Sugar beet 1 and BSRI Sugar beet 2 were found with increased ascorbate peroxidase (APX) activity under drought condition. In parallel, polyphenol oxidase (PPO) was increased in all cultivars except HELENIKA. Overall, the cultivars HELENIKA, RECODDINA, GREGOIA, SV2347, SV2348, BSRI Sugar beet 1, and BSRI Sugar beet 2 were found best fitted to the given drought condition. These findings would help further for the improvement of stress adaptive sugar beet cultivars development in the breeding program for drought-prone regions.
本研究旨在考察11个甜菜品种在可控温室干旱胁迫条件下的适应性。处理从30日龄的甜菜植株开始，干旱胁迫处理为连续10天不供水，而对照则按需供水。结果发现，干旱胁迫显著降低了所有品种的植株生长、光合色素和光合量子产量，但在S1（MAXIMELLA）、S2（HELENIKA）、S6（RECODDINA）、S8（SV2347）和S11（BSRI Sugarbeet 2）品种中观察到相对较好的结果。此外，在MAXIMELLA、HELENIKA、TERRANOVA、GREGOIA、SV2348和BSRI Sugar beet 2品种中，干旱条件下脯氨酸、甘氨酸甜菜碱、总可溶性碳水化合物、总可溶性糖、总多酚、总黄酮和DPPH自由基清除活性等渗透调节物质显著增加。相反地，超氧化物歧化酶（SOD）、过氧化氢酶（CAT）和过氧化物酶（POD）等酶的活性在所有品种中均显著降低，而在干旱条件下，SV2347、BSRI Sugar beet 1和BSRI Sugar beet 2品种的抗坏血酸过氧化物酶（APX）活性增加。同时，除HELENIKA外，所有品种的多酚氧化酶（PPO）均增加。总体而言，发现HELENIKA、RECODDINA、GREGOIA、SV2347、SV2348、BSRI Sugar beet 1和BSRI Sugar beet 2品种最适合给定的干旱条件。这些发现将有助于在易旱地区的育种计划中进一步改良具有胁迫适应性的甜菜品种。
