向离体叶片外源供应泛酰内酯可提高其泛酸水平。
Exogenous supply of pantoyl lactone to excised leaves increases their pantothenate levels.
作者信息
Rathinasabapathi Bala, Raman Suresh Babu
机构信息
Horticultural Sciences Department, University of Florida, Gainesville, FL 32611, USA.
出版信息
Ann Bot. 2005 May;95(6):1033-7. doi: 10.1093/aob/mci114. Epub 2005 Mar 14.
BACKGROUND AND AIMS
All plants synthesize pantothenate but its synthesis and regulation are not well understood. The aim of this work is to study the effect of exogenous supply of precursor compounds on pantothenate levels in leaves.
METHODS
Precursor compounds were supplied in solution to excised leaves and the pantothenate content was measured using a microbial method.
KEY RESULTS
Pantothenate levels in excised leaves of Limonium latifolium, tomato (Lycopersicon esculentum), bean (Phaseolus vulgaris) and grapefruit (Citrus x paradisi) were examined following an exogenous supply of the precursor compounds pantoyl lactone or beta-alanine. Significantly higher levels of extractable pantothenate were found when pantoyl lactone was supplied, but not when beta-alanine was supplied despite a measurable uptake of beta-alanine into the leaf.
CONCLUSIONS
The results suggested that the pantoate supply may be rate-limiting or regulating pantothenate synthesis in leaves.
背景与目的
所有植物都能合成泛酸，但其合成与调控机制尚未完全明确。本研究旨在探究前体化合物的外源供应对叶片中泛酸水平的影响。
方法
将前体化合物溶解后供应给离体叶片，采用微生物法测定泛酸含量。
关键结果
在前体化合物泛酰内酯或β-丙氨酸外源供应后，检测了宽叶补血草、番茄（番茄）、菜豆（菜豆）和葡萄柚（柑橘× paradisi）离体叶片中的泛酸水平。供应泛酰内酯时，可提取泛酸水平显著升高，但供应β-丙氨酸时，尽管叶片可检测到β-丙氨酸的吸收，但泛酸水平并未升高。
结论
结果表明，泛解酸的供应可能是叶片中泛酸合成的限速步骤或调控因素。
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