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首页> 外文期刊>The Journal of Horticultural Science & Biotechnology >Heterogeneity in fruit distribution and stem water potential variations in peach trees under different irrigation conditions.
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Heterogeneity in fruit distribution and stem water potential variations in peach trees under different irrigation conditions.

机译：不同灌溉条件下桃树果实分布的异质性和茎水势的变化。

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摘要

The hypothesis that different fruit loads between 'scaffold branches' of a tree can induce water status differences was evaluated. Two different experiments were carried out, one under full irrigation conditions and the other under conditions in which peach trees were deficit irrigated (50%). Thinning treatments were applied in both experiments at the beginning of Stage III of fruit development: (1) EVEN-max with fruits distributed evenly with maximum crop, not thinned, (2) EVEN-min with fruits distributed evenly with minimal crop (<90 fruit tree-1), and (3) UNEVEN with fruits distributed unevenly by totally defruiting half of the available main (scaffold) branches per tree and leaving the other half unthinned. Stem water potential ( Psi stem) was measured with a pressure chamber at solar noon, and midday leaf conductance (gl) using a portable steady state porometer. UNEVEN trees always had intermediate Psi stem values between EVEN-max and EVEN-min, independent of irrigation treatments. Maximum fruit load differences between trees (EVEN-max compared to EVEN-min) produced Psi stem differences of 0.12 MPa and 0.25 MPa for full irrigation and deficit irrigation experiments, respectively. Although the magnitude of change in Psi stem was larger for deficit irrigated conditions, extreme differences in fruit load between main branches within an UNEVEN peach tree only induced differences in leaf conductance and had no effect on the water potential of scaffold branches independent of the irrigation experiment. Fruit load effects on branch water status were governed mainly by tree fruit load rather than scaffold branch fruit load. These results indicate that there is either little hydraulic isolation between the main stems, irrespective of tree water status, or an improved hydraulic efficiency associated with defruiting.
机译：评估了“脚手架树枝”之间不同的水果负荷会引起水状态差异的假设。进行了两个不同的实验，一个是在完全灌溉条件下，另一个是在缺水灌溉桃树的条件下（50％）。在两个试验中，在果实发育的第III阶段开始时均进行了间苗处理：（1）EVEN-max，果实均匀分布，最大收获量，未稀疏;（2）EVEN-min，果实均匀分布，最小收获量（<90 （1）果树，以及（3）即使水果分布不均，也就是通过将每棵树上可用的主要（脚手架）分支的一半完全去果，而另一半不稀疏。在太阳正午时用压力室测量茎水势（Psi茎），并使用便携式稳态孔隙仪测量中午叶片电导（gl）。不连树的Psi茎值始终介于EVEN-max和EVEN-min之间，与灌溉处理无关。树木之间最大的果实负荷差异（EVEN-max与EVEN-min相比）分别在完全灌溉和亏缺灌溉实验中产生的Psi茎差异分别为0.12 MPa和0.25 MPa。尽管在缺水灌溉条件下Psi茎的变化幅度较大，但与灌水试验无关，在偶数桃树中，主要分支之间的果实负荷的极端差异只会引起叶片电导率的差异，而对脚手架分支的水势没有影响。果实负荷对分支水状况的影响主要由树果实负荷而不是脚手架分支果实负荷决定。这些结果表明，无论树木的水分状况如何，主茎之间几乎没有水力隔离，或者与去果相关的水力效率提高。

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