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Light controls stamen elongation via cryptochromes, phytochromes and COP1 through HY5 and HYH
Author(s) -
Marzi Davide,
Brunetti Patrizia,
Mele Giovanni,
Napoli Nadia,
Calò Lorenzo,
Spaziani Erica,
Matsui Minami,
De Panfilis Simone,
Costantino Paolo,
Serino Giovanna,
Cardarelli Maura
Publication year - 2020
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/tpj.14736
Subject(s) - stamen , cryptochrome , arabidopsis , elongation , auxin , biology , repressor , petal , microbiology and biotechnology , sepal , botany , genetics , gene , gene expression , mutant , pollen , circadian clock , materials science , ultimate tensile strength , metallurgy
SUMMARY In Arabidopsis, stamen elongation, which ensures male fertility, is controlled by the auxin response factor ARF8, which regulates the expression of the auxin repressor IAA19 . Here, we uncover a role for light in controlling stamen elongation. By an extensive genetic and molecular analysis we show that the repressor of light signaling COP1, through its targets HY5 and HYH, controls stamen elongation, and that HY5 – oppositely to ARF8 – directly represses the expression of IAA19 in stamens. In addition, we show that in closed flower buds, when light is shielded by sepals and petals, the blue light receptors CRY1/CRY2 repress stamen elongation. Coherently, at flower disclosure and in subsequent stages, stamen elongation is repressed by the red and far‐red light receptors PHYA/PHYB. In conclusion, different light qualities – sequentially perceived by specific photoreceptors – and the downstream COP1–HY5/HYH module finely tune auxin‐induced stamen elongation and thus male fertility.