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Physiological basis of QTLs for boron efficiency in Arabidopsis thaliana

机译：拟南芥硼效率QTL的生理基础

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摘要

Boron (B) is an essential micronutrient for higher plants, but the adaptability of plants to B deficiency varies widely both between and within species. On the basis of quantitative trait loci (QTL) analysis of the B efficiency coefficient (BEC) detected in an Arabidopsis thaliana Ler x Col recombinant inbred (RI) population, B efficiency was evaluated in the original parents (Ler and Col-4) and two F sub(8) lines (1938 and 1961), both of which were selected on the basis of phenotype and genotype of the RI population. The parent Ler and F sub(8) progeny 1938 had higher BEC and B utilization efficiency (BUE) values than those calculated for parent Col-4 and F sub(8) progeny 1961, respectively, when grown in nutrient solutions containing three different concentrations of B. The magnitude of the BEC and BUE-values was correlated closely with the combined phenotypic effect of the corresponding QTLs among the four genotypes. The F sub(8) line, 1938, inherited all four B-efficient QTLs, AtBE1-1, AtBE1-2, AtBE2 and AtBE5, from its two original parents. The four QTLs accounted for 65.2% of the total variation in BEC and 1938 showed the highest BEC (0.74) and BUE (10.5) values among the four genotypes when grown in nutrient solution that contained 0.324 mu M B. Only one minor-effect QTL (AtBE1-1) was found in the parent, Col-4. This QTL accounted only for 8.8% of total BEC variation and resulted in the lowest BEC (0.39) and BUE (0.76) in Col-4 when it was grown in nutrient solution that contained 0.324 mu M B. Phenotypic profile analysis showed that 1938 not only inherited the B utilization and distribution characteristics found in the silique of Ler, but also acquired the low-B requirement for root and shoot growth from Col-4. As a result, this genotype displayed the strongest tolerance to B deficiency. In addition, both B-efficient genotypes, 1938 and Ler, possessed the QTL (AtBE1-2) and both plants had high-seed yields and high-B distributions in their siliques. Therefore, we hypothesize that QTL AtBE1-2 plays a role in the utilization and/or the distribution of B to the silique when plants suffer from B deficiency. A close correlation between the B-efficient phenotype and the corresponding QTLs indicated that phenotypic differences depend on the genetic variation.
机译：硼（B）是高等植物必需的微量营养素，但植物对B缺乏的适应性在物种之间和物种内部差异很大。根据对拟南芥Ler x Col重组近交群体（RI）群体中检测到的B效率系数（BEC）进行定量性状基因座（QTL）分析，对原始亲本（Ler和Col-4）和两条F sub（8）品系（1938年和1961年），都是根据RI种群的表型和基因型选择的。当在含有三种不同浓度的营养液中生长时，1938年的Ler和F sub（8）亲代后代的BEC和B利用效率（BUE）值分别高于1961年的Col-4和F sub（8）代后代计算的值。 BEC和BUE值的大小与四种基因型中相应QTL的综合表型效应密切相关。 F sub（8）系列（1938）从其两个原始父级继承了所有四个B有效QTL，即AtBE1-1，AtBE1-2，AtBE2和AtBE5。四个QTL占BEC总变异的65.2％，当1938在含有0.324μMB的营养液中生长时，四个基因型中BEC（0.74）和BUE（10.5）值最高。仅一个次效QTL （AtBE1-1）在亲本Col-4中发现。在含有0.324μM B的营养液中生长时，此QTL仅占总BEC变异的8.8％，导致Col-4的BEC（0.39）和BUE（0.76）最低。表型分析表明，1938年没有它不仅继承了Ler角果树种中的B利用和分布特征，而且还从Col-4获得了对根和芽生长的低B需求。结果，该基因型显示出对B缺乏症的最强耐受性。此外，B型高效基因型（1938年和Ler）均具有QTL（AtBE1-2），并且两种植物的单株都具有高种子产量和高B分布。因此，我们假设当植物遭受B缺乏症时，QTL AtBE1-2在B的利用和/或向群体中分配B中起作用。 B有效表型和相应的QTL之间的密切相关表明，表型差异取决于遗传变异。

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