کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2826661 1162257 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phloem: the long and the short of it
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
Phloem: the long and the short of it
چکیده انگلیسی

The structure of phloem sieve-element-companion-cell complexes reflects a duality of function: to conduct photoassimilates throughout the plant, and to exchange solutes between the phloem and surrounding tissues. The conceptual integration of these long- and short-distance functions requires the abandonment of a long-cherished concept in phloem physicochemistry, that source–sink turgor differentials control flow. The manifest inability of decentralized organisms such as plants to control phloem translocation centrally disqualifies such differentials as control variables; besides, the phloem is maximally efficient if the pressure differentials are small. Testing this hypothesis and whether turgor differentials are small will require a significant recommitment to studying the quantitative anatomy of phloem.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: - Volume 11, Issue 1, January 2006, Pages 26–32
نویسندگان
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