Genotypic variation for potassium efficiency in wild and domesticated watermelons under ample and limited potassium supply
Genotypic variation for potassium efficiency in wild and domesticated watermelons under ample and limited potassium supply
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DOI：
10.1002/jpln.201200007
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发表时间：
2013-06
影响因子：
2.5
通讯作者：
M. Fan;Z. Bie;Huiying Xie;Fang Zhang;Shuang Zhao;Hongyan Zhang
中科院分区：
文献类型：
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作者：
M. Fan;Z. Bie;Huiying Xie;Fang Zhang;Shuang Zhao;Hongyan Zhang
摘要钾是西瓜重要的营养元素。马特森然而，关于西瓜钾效率的遗传变异的知识很少。64西瓜基因型生长条件下，充足的（6毫米）和有限的（0.1毫米）钾供应在温室中。38个野生型（C.毛状变种citroide）和26个国产基因型（C.毛状变种lanatus）水培30 d。测定了地上部干重、地上部钾浓度、钾吸收量、钾利用指数（地上部干重/地上部钾浓度）、相对地上部干重（限钾地上部干重/充足钾地上部干重）和相对地上部钾浓度（限钾地上部钾浓度/充足钾地上部钾浓度）。K效率在基因型间存在显著差异，K效率的划分以相对地上部干重和相对地上部K浓度的95%置信区间为中效区间。高于或低于该区间的基因型数据被分类为K-有效或K-无效。我们确定了8个K-效率的基因型，其中4个是野生型。因此，野生西瓜可以用于育种计划，以提高驯化西瓜的钾效率。
Abstract Potassium (K) is an important nutrient for watermelon ( Citrullus lanatus Thunb. Matsum. & Nakai).However, there is little knowledge about genetic variations in K efficiency in watermelon. Sixty-four watermelon genotypes were grown under conditions of ample (6 mM) and limited (0.1 mM)K supply in a glasshouse. Thirty-eight wild genotypes ( C. lanatus var. citroide ) and 26 domesti-cated genotypes ( C. lanatus var. lanatus ) were cultivated hydroponically for 30 d. Shoot dryweight, shoot K concentration, K uptake, K-use index (shoot dry weight / shoot K concentration),relative shoot dry weight (shoot dry weight under limited K / shoot dry weight under ample K),and relative shoot K concentration (shoot K concentration under limited K / shoot K concentra-tion under ample K) were determined. Significant differences were observed among genotypes.The K efficiency was classified based on a medium-efficiency interval which is equivalent to the95% confidence interval of the mean relative shoot dry weight and relative shoot K concentra-tion. Genotypic data above or below this interval were classified as either K-efficient or K-ineffi-cient. We identified eight K-efficient genotypes, of which four were wild types. Thus, wild water-melons can be used in breeding programs to improve the K efficiency of domesticated waterme-lons.