A pleiotropic Arabidopsis thaliana mutant with inverted root chirality
A pleiotropic Arabidopsis thaliana mutant with inverted root chirality
复制标题
具有倒根手性的多效性拟南芥突变体
作者：
B. Marinelli;S. Gomarasca;C. Soave
摘要。圆周运动是植物生长器官的振荡运动，被认为是由生长固有的内源性节律过程引起的。环绕的器官，随着它们的延伸，呈现出一种螺旋状的轨迹。拟南芥（L.）Heynh。环状结构在初生根中特别明显，并且像在大多数植物中一样，当从生长尖端的方向向上观察时，呈右手方向。我们发现了一个具有左旋根环的拟南芥多效突变体。突变体的主要异常是：(i)所有器官的大小减小，主要是由于细胞伸长或扩张的缺陷；（ii）茎髓细胞呈之字形，使人联想到Pisum的lk突变体的“直立”表型；（iii）突变体的根是向地性的，但随着它们的生长，它们形成紧密的，左旋的线圈。遗传上，突变取决于两个独立的单基因隐性因素的存在。两种因子的突变等位基因对地上器官生长的改变方式相似，但在根水平上有所不同：一种主要产生非环折根，另一种主要改变环折方向，由右向左。
Abstract. Circumnutation is an oscillating movement of a growing plant organ that is believed to result from an endogenous rhythmic process intrinsic to growth. Circumnutating organs, as they extend, describe a helical trace. In Arabidopsis thaliana (L.) Heynh. circumnutation is particularly evident in primary roots and occurs, as in most plants, in a right-handed direction when viewed from above in the direction of the growing tips. We have discovered a pleiotropic mutant of Arabidopsis with left-handed root circumnutation. Major abnormalities of the mutant are: (i) a reduced size of all organs, mainly due to a defect in cell elongation or expansion; (ii) a zigzagging pattern of stem pith cells, reminiscent of the “erectoides” phenotype of the lk mutant of Pisum; (iii) roots of the mutant are gravitropic but as they grow, they form tight, left-handed coils. Genetically, the mutant depends on the presence of two independent monogenic recessive factors acting additively. The mutant alleles of both factors alter the growth of the aerial organs in a similar manner but differ at the root level: one mainly produces non-circumnutating roots, the other changes the direction of circumnutation from right to left hand.
影响因子：
10.5
作者：
TAKAHASHI, T;GASCH, A;CHUA, NH
通讯作者：
CHUA, NH