Density Effects on Semi-dwarf and Early Flowering Mutants of Under Continuous Light

Overview

Journal Plant Biotechnol (Tokyo)

Date 2019 Jul 6

PMID 31274995

Authors

Kei Takahashi

Miyuki Hara

Kana Miyata

Ryosuke Hayama

Tsuyoshi Mizoguchi

Affiliations

Soon will be listed here.

Abstract

Plant growth promotion and inhibition under low- and high-density conditions (referred to as the density effect) has been studied extensively. Here, we show that such density effects were unaffected by the position of wild-type (WT) and () strains of (Arabidopsis) within pots. Additionally, () and were newly discovered alleles of the () and () genes that are involved in brassinosteroid biosynthesis. Unlike , the semi-dwarf mutants of and exhibited normal flowering times and a shortening of rosette leaves at high densities. Moreover, the and variants suppressed flowering stem shortening at high densities. , but not suppressed the reduction in silique number at intermediate densities. SPINDLY (SPY) is a negative regulator of GA signaling, while PHYTOCHROME B (PHYB) is a red-light photoreceptor. High-density growth did not reduce the flowering time of mutants, but did affect that of mutants. Neither nor suppressed the shortening of rosette leaves at high densities; however, suppressed flowering stem shortening. Moreover, suppressed the reduction of silique number at high densities, while and promoted the decrease. These data suggest that GA, BR, and light signaling pathways play important roles in the density effect.

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