FLOWERING AND BRANCHING IN LATHYRUS-ODORATUS L - ENVIRONMENTAL AND GENETIC-EFFECTS
FLOWERING AND BRANCHING IN LATHYRUS-ODORATUS L - ENVIRONMENTAL AND GENETIC-EFFECTS
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DOI：
10.1093/oxfordjournals.aob.a086950
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发表时间：
1985-01-01
期刊：
影响因子：
4.2
通讯作者：
MURFET, IC
中科院分区：
文献类型：
--
作者：
ROSS, JJ;MURFET, IC
根据对光周期的响应，在 L. odoratus L. 品种中鉴定出三个开花类别。 DN 类本质上是日中性的，它对应于早期（冬季）开花群体。 LDI 和 LDH 类是长日照类型，分别对光周期具有中等和高响应。这些班级对应于 Cuthbertson（春季）和晚（夏季）组。所有类别均表现出对春化的显着反应。在种子春化 4 周后的短日照条件下，这些类别最容易区分，这些条件用于检查类别之间和类别内杂交的分离。类别差异由 dn、Dni 和 Dnh 3 个等位基因决定，它们在纯合条件下分别给出表型 DN、LDI 和 LDH。 LDH 类型的杂交。 DN 和 LDH 倍。 LDI 在 F2 中根据开花节点或开花天数给出了离散的 3:1 分离。 Dni 对 dn 表现出很少或没有优势，并且 Dni/dn 类型的偏析给出了连续三峰分布或离散的 3 类偏析，比例为 1:2:1。这三个类别在分枝习性方面表现出显着差异，这种差异在开花之前就很明显。 DN 分离很少产生的侧枝。 LDH 从基部节分离大量分枝，而 LDI 分离分枝倾向中等。 DN 基因座的等位基因也影响芽中干物质的分布，例如与 DN 分离相比。 LDH 分离的顶芽、叶子和主枝较小，但侧枝重量较大。 Dnh (Dni) 产品的主要作用可能是引导同化流。
Three flowering classes were identified among L. odoratus L. cultivars on the basis of response to photoperiod. Class DN is essentially day-neutral and its corresponds to the early (winter) flowering group. Classes LDI and LDH are long day types with an intermediate and high response to photoperiod, respectively. These classes correspond to the Cuthbertson (spring) and late (summer) groups. All classes show a substantial response to vernalization. The classes are most easily distinguished in short day conditions following 4 wk of seed vernalization and these conditions were used to examine segregration in crosses between and within classes. The class differences are determined by 3 allelic genes, dn, Dni and Dnh, which in homozygous condition give phenotypes DN, LDI and LDH, respectively. Crosses of the type LDH .times. DN and LDH .times. LDI gave discrete 3:1 segregations in F2 in terms of either flowering node or days to open flower. Dni showed little or no dominance over dn and segregations of the type Dni/dn gave either continuous trimodal distributions or discrete, 3 class segregations in the ratio 1:2:1. The 3 classes showed marked differences in branching habit which were apparent well before flower initiation. DN segregates seldom produced laterals. LDH segregates branched profusely from the basal nodes while LDI segregates were intermediate in branching tendency. The alleles at the dn locus also influenced dry matter distribution in the shoot, e.g., compared with DN segregates. LDH segregates had smaller apical buds, leaves and main shoots but a greater weight of lateral branches. The primary role of the Dnh (Dni) product may be to direct assimilate flow.