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Foliar application of uniconazole improves yield through enhancement of photosynthate partitioning and translocation to tuberous roots in sweetpotato

文献类型： 外文期刊

作者： Duan, Wenxue 1 ; Zhang, Haiyan 1 ; Xie, Beitao 1 ; Wang, Baoqing 1 ; Hou, Fuyun 1 ; Li, Aixian 1 ; Dong, Shunxu 1 ; Qin, 1 ;

作者机构： 1.Shandong Acad Agr Sci, Crop Res Inst, Jinan, Shandong, Peoples R China

2.Minist Agr & Rural Affairs, Sci Observat & Expt Stn Tuber & Root Crops Huang, Jinan, Shandong, Peoples R China

3.Shandong Acad Agr Sci, Jinan, Shandong, Peoples R China

关键词： Uniconazole; isotope C-13 distribution; photosynthate transport; tuberous root yield; sweetpotato

期刊名称：ARCHIVES OF AGRONOMY AND SOIL SCIENCE （ 影响因子：3.092； 五年影响因子：2.745 ）

ISSN： 0365-0340

年卷期：

页码：

收录情况： SCI

摘要： To examine the effects of uniconazole (UCZ) on the distribution and transport of photosynthate in sweetpotatoes, three spraying levels of UCZ, 0 (control), 50 and 100 mg L-1, were exposed to an experimental field cultivated with Jishu26 ('J26MODIFIER LETTER PRIME) and Xushu32 ('X32MODIFIER LETTER PRIME) varieties. Compared to control, the distribution of carbon-13 (C-13) was significantly higher in the tuberous roots of both varieties treated with UCZ. In addition, UCZ treatments promoted a desirable top-to-base sucrose gradient and significant greater declines in the top-to-bottom amino acid and potassium ion (K+) gradients along the stem. Higher tuberous root yields were found in the UCZ-treated 'J26MODIFIER LETTER PRIME and 'X32MODIFIER LETTER PRIME. In comparison to 50 mg L-1 UCZ, 'J26MODIFIER LETTER PRIME treated with 100 mg L-1 UCZ exhibited significantly higher distribution ratio of C-13 in tuberous root, and reductions in the top-to-bottom amino acid and K+ gradients along the stems at 105 and 150 days after planting. Furthermore, 100 mg L-1 of UCZ application exhibited a significantly higher tuberous root yield. For 'X32MODIFIER LETTER PRIME, the two concentrations of UCZ demonstrated no significant differences in these parameters. A reasonable distribution structure of photosynthates that responsible for high yields is associated with the desirable sucrose, ammonia nitrogen (N) or K+ gradient along the stems caused by UCZ application.

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