文献类型： 外文期刊

作者： Yang, Jin ¹ ; Qiao, Huanhuan ¹ ; Wu, Chao ³ ; Huang, Hong ¹ ; Nzambimana, Claude ¹ ; Jiang, Cheng ¹ ; Wang, Jichun ¹ ; Tang, Daobin ¹ ; Zhong, Weiran ² ; Du, Kang ¹ ; Zhang, Kai ¹ ; Lyu, Changwen ¹ ;

作者机构： 1.Southwest Univ, Coll Agron & Biotechnol, Chongqing 400715, Peoples R China

2.Chongqing Acad Agr Sci, Special Crops Inst, Chongqing 402160, Peoples R China

3.Key Lab Biol & Genet Breeding Tuber & Root Crops C, Chongqing 400715, Peoples R China

4.Minist Educ, Engn Res Ctr South Upland Agr, Chongqing 400715, Peoples R China

5.Southwest Univ, Human Resources Dept, Chongqing 400715, Peoples R China

关键词： Ipomoea batatas (L.) Lam; weak light; agronomic traits; photosynthetic physiology; transcriptome analysis

期刊名称：PLANTS-BASEL （ 影响因子：4.0； 五年影响因子：4.4 ）

ISSN： 2223-7747

年卷期： 2024 年 13 卷 16 期

页码：

收录情况： SCI

摘要： In the relay intercropping system of maize/sweet potato, the growth of the sweet potatoes is seriously limited by weak light stress in the early stage due to shade from maize plants. However, it is not clear how the weak light affects sweet potatoes and causes tuberous root loss. By setting two light intensity levels (weak light = 30% transmittance of normal light), this study evaluated the responses of two sweet potato cultivars with different tolerances to weak light in a field-based experiment and examined the divergence of gene expression related to light and photosynthesis in a pot-based experiment. The results showed that under weak light, the anatomic structure of functional leaves changed, and the leaf thickness decreased by 39.98% and 17.32% for Yuhongxinshu-4 and Wanshu-7, respectively. The ratio of S/R increased, and root length, root superficial area, and root volume all decreased. The photosynthetic enzyme rubisco was weakened, and the net photosynthetic rate (Pn) declined as well. The level of gene expression in Wanshu-7 was higher than that of Yuhongxinshu-4. The KEGG analysis showed that differentially expressed genes from the two cultivars under weak-light stress used the same enrichment pathway, mainly via glutathione metabolism and flavonoid biosynthesis. After full light levels were restored, the differentially expressed genes were all enriched in pathways such as photosynthesis, photosynthetic pigment synthesis, and carbon metabolism. These findings indicated that weak light changed the plant morphology, photosynthetic physiology and gene expression levels of sweet potatoes, which eventually caused losses in the tuberous root yield. The more light-sensitive cultivar (Wanshu-7) had stronger reactions to weak light. This study provides a theoretical basis and strategy for breeding low-light-tolerant varieties and improving relay intercropping production in sweet potatoes.