Song Xin, Song Baiquan, Huo Jialu, Liu Huajun, Adil Muhammad Faheem, Jia Qiue, Wu Wenyu, Kuerban Abudukadier, Wang Yan, Huang Wengong
National Sugar Crops Improvement Center & Sugar Beet Engineering Research Center Heilongjiang Province & College of Advanced Agriculture and Ecological Environment, Heilongjiang University, Harbin, China.
Research Institute of Economic Crops, Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang, China.
Front Plant Sci. 2023 Jan 16;13:1101171. doi: 10.3389/fpls.2022.1101171. eCollection 2022.
Boron (B) deficiency severely affects the quality of sugar beet production, and the employment of nutrient-efficient varieties for cultivation is a crucial way to solve environmental and resource-based problems. However, the aspect of leaf photosynthetic performance among B-efficient sugar beet cultivars remains uncertain. The B deficient and B-sufficient treatments were conducted in the experiment using KWS1197 (B-efficient) and KWS0143 (B-inefficient) sugar beet cultivars as study materials. The objective of the present study was to determine the impacts of B deficiency on leaf phenotype, photosynthetic capacity, chloroplast structure, and photochemical efficiency of the contrasting B-efficiency sugar beet cultivars. The results indicated that the growth of sugar beet leaves were dramatically restricted, the net photosynthetic rate was significantly decreased, and the energy flux, quantum yield, and flux ratio of PSII reaction centers were adversely affected under B deficiency. Compared to the KWS0143 cultivar, the average leaf area ratio of the KWS1197 cultivar experienced less impact, and its leaf mass ratio (LMR) increased by 26.82% under B deficiency, whereas for the KWS0143 cultivar, the increase was only 2.50%. Meanwhile, the light energy capture and utilization capacity of PSII reaction centers and the proportion of absorbed light energy used for electron transfer were higher by 3.42% under B deficiency; KWS1197 cultivar managed to alleviate the photo-oxidative damage, which results from excessive absorbed energy (), by increasing the dissipated energy (). Therefore, in response to B deprivation, the KWS1197 cultivar demonstrated greater adaptability in terms of morphological indices and photosynthetic functions, which not only explains the improved performance but also renders the measured parameters as the key features for varietal selection, providing a theoretical basis for the utilization of efficient sugar beet cultivars in future.
硼（B）缺乏严重影响甜菜生产质量，选用养分高效型品种进行种植是解决环境和资源问题的关键途径。然而，硼高效型甜菜品种叶片光合性能方面仍不明确。本试验以KWS1197（硼高效）和KWS0143（硼低效）甜菜品种为研究材料，设置了缺硼和硼充足处理。本研究的目的是确定缺硼对不同硼效率甜菜品种叶片表型、光合能力、叶绿体结构和光化学效率的影响。结果表明，缺硼条件下甜菜叶片生长受到显著抑制，净光合速率显著降低，PSII反应中心的能量通量、量子产额和通量比均受到不利影响。与KWS0143品种相比，KWS1197品种的平均叶面积比受影响较小，缺硼条件下其叶质量比（LMR）增加了26.82%，而KWS0143品种仅增加了2.50%。同时，缺硼条件下KWS1197品种PSII反应中心的光能捕获和利用能力以及用于电子传递的吸收光能比例提高了3.42%；该品种通过增加耗散能量来减轻过量吸收能量导致的光氧化损伤。因此，在缺硼情况下，KWS1197品种在形态指标和光合功能方面表现出更强的适应性，这不仅解释了其优良性能，还使所测参数成为品种选择的关键特征，为未来高效甜菜品种的利用提供了理论依据。
