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Gene discovery could lead to better soybean varieties for Northern United States
Date:7/15/2014

WEST LAFAYETTE, Ind. Researchers from Purdue University and the University of Nebraska-Lincoln have discovered a soybean gene whose mutation affects plant stem growth, a finding that could lead to the development of improved soybean cultivars for the northern United States.

Purdue agronomy professor Jianxin Ma (pronounced Jen-SHIN' Ma) and collaborators identified a gene known as Dt2, which causes semideterminacy in soybean plants. Semideterminate soybean plants - mid-size plants that continue vegetative growth even after flowering - can produce as many or more pods than current northern cultivars but do not grow as tall. Their reduced height makes them more resistant to lodging, a bending or breaking of the main plant stem.

"This gene could help us improve the yield potential and adaptability of soybeans for specific growing areas," Ma said. "We can now focus on developing a variety of elite semideterminate soybean cultivars, which could perform very well in high-yielding, irrigated environments such as Nebraska and northeastern Indiana."

Soybean cultivars are often divided into two groups: indeterminate - tall plants whose main stem continues to grow after flowering - and determinate - shorter, bushier plants whose main stem halts growth when blossoms begin to form.

Determinate soybean plants thrive in the longer growing season of the south while indeterminate plants' overlapping vegetative and reproductive stages make them better suited to the north. But the height of indeterminate cultivars renders them prone to lodging.

For northern soybean producers, semideterminate soybean plants could represent a "Goldilocks" cultivar, a "just right" alternative between the two. Semideterminate soybeans are easy to manage, have similar or better yields than indeterminate plants and can handle a short growing season, Ma said.

Only one semideterminate soybean cultivar, NE3001, is common in the United States. Having pinpointed Dt2 will enable
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Contact: Natalie van Hoose
nvanhoos@purdue.edu
765-496-2050
Purdue University
Source:Eurekalert  

Page: 1 2

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