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首页> 外文期刊>The Journal of Horticultural Science & Biotechnology >Is nitrogen stress more apparent in shaded, fruiting almond spurs than in exposed, non-fruiting spurs?
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Is nitrogen stress more apparent in shaded, fruiting almond spurs than in exposed, non-fruiting spurs?

机译：在带阴影的，有果实的杏仁马刺中，氮暴露是否比裸露的，无结果的马刺更明显？

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摘要

Leaf abscission rates and nitrogen concentrations in persistent leaves were tracked on non-fruiting and fruiting almond [Prunus dulcis (Mill.) D.A.Webb] spurs located in either well-exposed or shaded canopy positions. Fruiting spurs, especially in shaded positions, had higher mid-season leaf abscission rates than did non-fruiting spurs, and the difference in abscission rates between shaded, fruiting spurs and other spur sub-populations increased with tree nitrogen deficiency. Nitrogen concentrations and contents of persistent leaves were lower on fruiting spurs than on non-fruiting spurs. Nitrogen contents of persistent leaves did not decline substantially over the period of kernel development (a period of high nitrogen demand by the fruit) regardless of spur shading and fruiting status, or tree nitrogen status. This indicates that little net nitrogen remobilisation from persistent leaves occurred during this period, even on fruiting spurs on nitrogen-deficient trees. Nitrogen deficiency accentuated nitrogen stress in shaded and fruiting spurs, as indicated by early leaf abscission. However, such differential stress was not reflected by the nitrogen concentration or content of persistent leaves during kernel development. Thus, sampling of persistent leaves from the shaded, fruiting spur sub-population for nitrogen analyses did not provide a practical, more sensitive diagnostic indicator of tree nitrogen status than did conventional leaf sampling from non-fruiting spurs.
机译：在未结实和结实的杏仁[Prunus dulcis （Mill。）D.A. Webb]刺上，对暴露良好或遮荫的树冠处的叶片脱落率和氮含量进行了跟踪。结果性马刺，特别是在阴影处，比非结果性马刺具有更高的季节中期叶片脱落率，并且阴影，结果性马刺和其他刺果亚群之间的脱落率差异随树木氮缺乏而增加。结果果刺上的氮含量和持久叶含量低于未结果果刺。不论杂色阴影和结果状态或树木的氮状况如何，在籽粒发育期间（果实对氮的需求很高的时期），持久性叶片的氮含量均不会显着下降。这表明在此期间，即使在缺氮树上的果实杂果上，也很少发生来自持久性叶片的净氮迁移。早叶脱落表明，氮素不足会加剧阴影和果实刺中的氮胁迫。然而，在籽粒发育过程中，氮含量或持久叶片的含量并未反映出这种差异胁迫。因此，从阴影，果实杂种亚群中进行的持久叶取样用于氮分析，与从非果实杂种中常规叶片取样相比，没有提供实用，更敏感的树氮状况诊断指标。

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