CaJOINTLESS is a MADS-box gene involved in suppression of vegetative growth in all shoot meristems in pepper.
CaJOINTLESS is a MADS-box gene involved in suppression of vegetative growth in all shoot meristems in pepper.
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DOI：
10.1093/jxb/ers172
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发表时间：
2012-08
影响因子：
6.9
通讯作者：
Paran I
中科院分区：
文献类型：
--
作者：
Cohen O;Borovsky Y;David-Schwartz R;Paran I
为了解释辣椒（Capsicum spp.）枝条结构的遗传控制，鉴定了等位迟花突变体E-252和E-2537。这些突变体表现出多种多效性的影响组织的合轴芽。遗传作图和序列分析表明，突变体被破坏在CaJOINTLESS，直向同源的MADS盒基因JOINTLESS和SVP在番茄和拟南芥，分别。Cajointless的初生芽和合轴芽开花较晚，表明该基因在所有茎分生组织中都起着营养生长抑制因子的作用。虽然CaJOINTLESS和JOINTLESS具有部分保守的功能，但其对辣椒的开花时间和合轴发育的影响，以及对FASCICULATE（合轴发育自修剪的主要决定因素的同源物）的上位性比番茄强。此外，辣椒的单顶生花在突变株系中转化为由花和叶组成的结构。这种转换支持的假设，辣椒的单生花有一个神秘的花序身份，是由CaJOINTLESS抑制。野生型辣椒单生花的形成是花序分生组织早熟成熟的结果。
In aiming to decipher the genetic control of shoot architecture in pepper (Capsicum spp.), the allelic late-flowering mutants E-252 and E-2537 were identified. These mutants exhibit multiple pleiotropic effects on the organization of the sympodial shoot. Genetic mapping and sequence analysis indicated that the mutants are disrupted at CaJOINTLESS, the orthologue of the MADS-box genes JOINTLESS and SVP in tomato and Arabidopsis, respectively. Late flowering of the primary and sympodial shoots of Cajointless indicates that the gene functions as a suppressor of vegetative growth in all shoot meristems. While CaJOINTLESS and JOINTLESS have partially conserved functions, the effect on flowering time and on sympodial development in pepper, as well as the epistasis over FASCICULATE, the homologue of the major determinant of sympodial development SELF-PRUNING, is stronger than in tomato. Furthermore, the solitary terminal flower of pepper is converted into a structure composed of flowers and leaves in the mutant lines. This conversion supports the hypothesis that the solitary flowers of pepper have a cryptic inflorescence identity that is suppressed by CaJOINTLESS. Formation of solitary flowers in wild-type pepper is suggested to result from precocious maturation of the inflorescence meristem.
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