富士苹果秋梢连续摘心对13C 和15N 利用、分配的影响

 以4年生富士/SH₁/八棱海棠为试材，研究了秋梢连续摘心对富士苹果树体生理活性及¹³C和¹⁵N利用、分配的影响。结果表明，与不摘心（对照）相比，秋梢连续摘心的树体，其成熟叶片IAA含量显著降低，ABA含量显著上升；细根生长量降低为对照的51.68%，细根活力降低为对照的70.10%；植株¹³C固定量和¹⁵N利用率分别降低至对照的41.01%和32.22%。营养器官叶片和一年生新梢¹³C和¹⁵N含量、分配率显著下降；贮藏器官中枝干木质部¹³C和¹⁵N分配率升高至对照的3.59和3.86倍，而¹³C和¹⁵N含量仅为对照的1.45和1.26倍，主根木质部¹³C分配率与对照无显著差异，而¹³C含量降低至对照的47.40%，¹⁵N分配率升高至对照的1.80倍，而¹⁵N含量降低至对照的58.44%。

Effects of Continued Pinching on Characteristics of Utilization and Distribution of ^13C and ^15N for Red Fuji/SH1/ Malus robusta Rehd.

Experiments designed to test the effectiveness of autumn shoots on physiological activity and characteristics of distribution and utilization of ¹³C and ¹⁵N on 4-year-old apple tree（Fuji/SH₁/ Malus robusta Rehd.）. Results showed that continued pinching the autumn shoots，IAA content of leaves significantly decreased and ABA content significantly increased，fine root’s growth decreased to 51.68%，and the activity decreased to 70.10% of the control. ¹³C absorption and utilization of ¹⁵N decreased to 41.01% and 32.22% of the control. ¹³C and ¹⁵N absorption and partition ratio of leaves and new shoots significantly decreased. ¹³C and ¹⁵N partition ratio of stem xylem were significantly increased to 3.59 and 3.86 times，while the ¹³C and ¹⁵N absorption were only 1.45 and 1.26 times respectively. With no significantly differences of ¹³C partition ratio and significantly increased ¹⁵N partition ratio of main root xylem，the absorption of ¹³C and ¹⁵N were significantly decreased to 47.40% and 58.44% of the control.