Dye and calcium ascent in dogwood trees.
Dye and calcium ascent in dogwood trees.
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山茱萸树中的染料和钙上升。
DOI：
10.1104/pp.42.12.1800
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发表时间：
1967
期刊：
影响因子：
7.4
通讯作者：
W. A. Thomas
中科院分区：
文献类型：
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作者：
W. A. Thomas
钙是如何在植物的蒸腾过程中发挥作用的还不完全清楚。Biddulph等(2)。对大豆植物中钙离子和氚水的运动进行了比较，发现木质部本质上是钙离子的交换柱。Bell和Biddiilph(1)经过进一步的实验，得出木质部钙离子的运动分为两个阶段：a)钙离子进入蒸腾流后，在交换位点结合，然后借助蒸腾流上升，然后被其他钙离子取代；h)钙离子通过代谢细胞和沉积在草酸钙晶体中，从交换位点转移到更低的位置。Emmert(4)认为这一解释可以很好地解释强子豆植物的向上运动。NMorris，on和Heine(9)不相信这一机制可以解释所有多价阳离子的运动，d O'Leary（10）发现质量流理论不能完全被抛弃，作为对豆类植物钙上升的解释。作为开花茱萸树钙循环研究的一部分，研究人员进行了一些实验，以确定植物茎接种钙的短期分布和运输流的模式。
How calciuim imioves in the transpiration strean of plants is not fully uinderstood. Biddulph et al. (2) com.pared movemenllt of 4'Ca and tritiated water in bean plants and fotund that xylem operated essentially as an exchange coluimn for calciutm. After additional experiments, Bell and Biddiilph (1) concludifed that caleiuim movement in xylem occurred in 2 phases: a) After calciuim enteredl the transpiration stream, it xA as boundcl on exchanige sites and theni ascenlded with aid of the transpiratiOln streanm xx-heln it was replaced by other :o0ns: h) Calcilm was removed from exchange sites to more immol)ile positions dule to ioIn uitilizationi by metabolizing cells anid depositioni in calciuim oxalate crystals. Emmert (4) founiid this explanation satisfactory to interpret upwar(l movemenit of stronitiunm ini bean plants. NMorris,on and Heine (9) id nloit believe that this mechanism explaine(l movemient of all polyvalent catiolns, an,d O'Leary (10) foundi(i that the mass flow itheory could liOt be entirely discarded as an explaniationi forcalcilm ascenit in bean plants. As part of an investigation of cycling of calciuim by floxvering dogwood trees, experiments xvere condiucted tr) (letermine the pattern of the transptiration stream and the slhort-term distribuition of stem-inocilaited ca-ldciluTml.