Improving seed size, seed weight and seedling emergence in Camelina sativa by overexpressing the Atsob3-6 gene variant.

Abstract:

:Seedling stand establishment is a critical factor affecting crop yield in low-precipitation agricultural regions. This is especially true for small seeded crops, such as Camelina (Camelina sativa) and canola (Brassica napus), that need to be planted shallow. Deeper planting would be desirable so that seeds can access soil moisture and bigger seeds could improve emergence and stand establishment by providing the energy necessary for seedling elongation. AHL (AT-Hook Containing, Nuclear Localized) genes play an important role in seedling growth and development. AHL proteins contain two structural units, the DNA-binding AT-hook motif and the Plant and Prokaryote Conserved (PPC) domain, required for protein-protein interactions. Our previous studies demonstrate that AtAHL29/SOB3 (Suppressor of phytochrome B-4 #3) regulates seedling development in Arabidopsis (Arabidopsis thaliana). Activation-tagged overexpression of AtSOB3 (Atsob3-D) represses the long-hypocotyl phenotype of an Arabidopsis phytochrome B mutant. In contrast, overexpression of the Atsob3-6 variant (Atsob3-6-OX), with a non-functional AT-hook, confers a long-hypocotyl phenotype. In this study, we demonstrate the role of Atsob3-D and Atsob3-6-OX in modulating seed size and hypocotyl length in the brassicas Arabidopsis and Camelina. In Arabidopsis, Atsob3-D reduces seed weight whereas Atsob3-6-OX increases seed weight and size when compared to the wild type. Similarly, Atsob3-6-OX transgenic Camelina seedlings are taller than the wild type, and produce larger and heavier seeds. These larger Atsob3-6-OX Camelina seeds also confer better emergence in deep-soil planting when compared to the wild type. Taken together, Atsob3-6-OX increases seed size, seed weight, seedling hypocotyl length and stand establishment in the oilseed crop Camelina.

journal_name

Transgenic Res

journal_title

Transgenic research

authors

Sharma Koirala P,Neff MM

doi

10.1007/s11248-020-00208-9

subject

Has Abstract

pub_date

2020-08-01 00:00:00

pages

409-418

issue

4

eissn

0962-8819

issn

1573-9368

pii

10.1007/s11248-020-00208-9

journal_volume

29

pub_type

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