Maternal control of integument cell elongation and zygotic control of endosperm growth are coordinated to determine seed size in Arabidopsis
Maternal control of integument cell elongation and zygotic control of endosperm growth are coordinated to determine seed size in Arabidopsis
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DOI：
10.1105/tpc.104.027136
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发表时间：
2005-01-01
期刊：
影响因子：
11.6
通讯作者：
Berger, F
中科院分区：
文献类型：
--
作者：
Garcia, D;Fitz Gerald, JN;Berger, F
我们使用拟南芥作为一个模型来研究协调细胞增殖和细胞伸长的三个组成部分，并排在种子中发展。其中两个，胚和它的滋养附件，胚乳，被置于合子控制下，并在母体控制下的种子珠被内发育。结果表明，珠被细胞增殖和胚乳生长在很大程度上是相互独立的。相比之下，防止细胞伸长的珠被突变透明种皮glabra2（ttg2）限制胚乳和种子生长。相反，胚乳生长由HAIKU（IKU）遗传途径控制调节珠被细胞伸长。TTG2缺陷型种子珠被与由iku突变引起的胚乳大小减小的组合鉴定珠被细胞伸长和胚乳生长为种子大小的主要调节因子。我们的研究结果强烈表明，母本和合子控制之间的串扰代表了拟南芥种子大小的协调控制的主要调节器。
We use Arabidopsis thaliana as a model to investigate coordination of cell proliferation and cell elongation in the three components that develop side by side in the seed. Two of these, the embryo and its nurturing annex, the endosperm, are placed under zygotic control and develop within the seed integument placed under maternal control. We show that integument cell proliferation and endosperm growth are largely independent from each other. By contrast, prevention of cell elongation in the integument by the mutation transparent testa glabra2 (ttg2) restricts endosperm and seed growth. Conversely, endosperm growth controlled by the HAIKU (IKU) genetic pathway modulates integument cell elongation. Combinations of TTG2 defective seed integument with reduction of endosperm size by iku mutations identify integument cell elongation and endosperm growth as the primary regulators of seed size. Our results strongly suggest that a cross talk between maternal and zygotic controls represents the primary regulator of the coordinated control of seed size in Arabidopsis.