作物学报 ›› 2020, Vol. 46 ›› Issue (3): 462-471.doi: 10.3724/SP.J.1006.2020.94038
• 研究简报 • 上一篇
刘永晨1,司成成2,柳洪鹃1,*(),张彬彬1,史春余1,*()
Yong-Chen LIU1,Cheng-Cheng SI2,Hong-Juan LIU1,*(),Bin-Bin ZHANG1,Chun-Yu SHI1,*()
摘要:
为了明确土壤通气性对甘薯源库间光合产物运转的调控机制, 本研究以淀粉型品种商薯19和济徐23为试验材料, 设置疏松、对照和紧实3个处理进行大田试验, 研究结果表明, 与对照处理相比, 疏松处理显著提高2个品种的块根产量和经济系数, 2年平均增幅分别为27.03%~38.74%和6.30%~13.05%, 紧实处理则显著降低2个品种的块根产量和经济系数, 2年平均降幅分别为17.87%~15.92%和10.83%~15.63%。功能叶 13C标记结果显示, 疏松处理显著提高块根中光合产物的输入效率。疏松处理显著提高块根中蔗糖和淀粉含量, 显著降低地上部器官中淀粉含量和茎中尤其是茎的中下部中蔗糖含量; 紧实处理则显著降低块根中蔗糖和淀粉含量, 而显著提高地上部器官蔗糖和淀粉含量, 且茎中下部蔗糖含量增幅较大。疏松处理显著降低50~150 d茎基部与茎顶部间和茎基部与块根间的蔗糖含量差; 紧实处理则显著提高茎基部与茎顶部间和茎基部与块根间的蔗糖含量差, 且茎基部与块根间蔗糖含量差的变幅大于茎基部与茎顶部间的蔗糖含量差。相关分析表明, 茎基部与块根间、茎基部与茎顶部间蔗糖含量差与块根蔗糖和淀粉含量呈极显著负相关。说明改善土壤通气性可促进茎基部光合产物向块根的运转, 提高块根中碳水化合物含量, 增加块根产量。
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