Shoot has important roles in strigolactone production of rice roots under sulfur deficiency
Shoot has important roles in strigolactone production of rice roots under sulfur deficiency
复制标题
缺硫条件下芽在水稻根系独脚金内酯生产中发挥重要作用
DOI：
10.1080/15592324.2021.1880738
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发表时间：
2021
影响因子：
2.9
通讯作者：
Umehara Mikihisa
中科院分区：
文献类型：
--
作者：
Shindo Masato;Nagasaka Seiji;Kashiwada Shosaku;Shimomura Koichiro;Umehara Mikihisa
独脚金内酯 (SL) 是一类控制植物结构的植物激素。根中的 SL 水平取决于根际的营养条件，特别是氮 (N) 和磷 (P) 的水平。我们之前的研究表明，水稻中硫（S）以及氮和磷的缺乏会诱导SL的产生，并抑制芽分枝，加速叶片衰老，并调节叶片关节角度。在这里，我们使用分根系统显示了在硫充足和硫缺乏条件下水稻的生物量、总硫含量和 SL 水平。当根系的一部分在S充足的培养基中培养而另一部分在S缺乏的培养基(+S/-S)中培养时，相对于+S/+S条件，芽鲜重不受影响。在-S/-S条件下芽重显着下降。相反，+S和-S条件下根部鲜重没有显着差异。在+S/-S条件下，两个部分的SL水平都系统性降低，地上部S含量增加，但相对于-S/-S条件，缺乏S的培养基中根部S含量不受影响。这些结果表明，芽而非根识别硫缺乏，从而诱导根产生 SL。
Strigolactones (SLs) are a class of plant hormones that control plant architecture. SL levels in roots are determined by the nutrient conditions in the rhizosphere, especially the levels of nitrogen (N) and phosphorus (P). Our previous research showed that SL production is induced in response to deficiency of sulfur (S) as well as of N and P, and inhibits shoot branching, accelerates leaf senescence, and regulates lamina joint angle in rice. Here we show biomass, total S contents, and SL levels in rice under S-sufficient and S-deficient conditions using a split-root system. When one part of the root system was cultured in S-sufficient medium and the other in S-deficient medium (+S/−S), shoot fresh weight was unaffected relative to the +S/+S condition. The shoot weight significantly decreased in −S/−S condition. In contrast, there was no significant difference in root fresh weight between +S and −S conditions. In +S/−S condition, SL levels were systemically reduced in both parts, the shoot S content increased, but the root S content in S-deficient medium was unaffected relative to the −S/−S condition. These results suggest that shoots, not roots, recognize S deficiency, which induces SL production in roots.