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Genotype by environment interactions of lucerne (Medicago sativa L.) in a cool temperate climate

journal contribution
posted on 2023-05-17, 00:11 authored by Pembleton, KG, Smith, RS, Richard RawnsleyRichard Rawnsley, Donaghy, DJ, Humphries, AW
Genotype by environmental interactions in lucerne (Medicago sativa L.) present considerable challenges when selecting an appropriate cultivar for a particular location and farming system. Data on the yield and persistence of a range of lucerne cultivars and experimental lines grown in two Tasmanian environments, Forth (41.20°S, 146.27°E, Red Ferrosol soil, under cutting with high fertiliser inputs, i.e. a high yield potential environment) and Cranbook (42.00°S, 148.03°E, Red Ferrosol soil, under grazing with low fertiliser inputs, i.e. a low yield potential environment) were examined using winter activity class as the experimental factor. At Forth, winter-dormant lucernes were the lowest yielding genotypes. In contrast, at Cranbrook, highly winter-active genotypes had lower plant persistence and dry matter yield than winter-dormant genotypes. Modified joint linear regression analysis showed that in a cool temperate climate, winter-dormant genotypes are more suited to a low yield potential environment, whereas highly winter-active genotypes are adapted to a high yield potential environment. Both the semi-winter-dormant and the winter-active genotypes were adapted to all environments. The dry matter yield of winter-dormant and highly winter-active genotypes was most sensitive to environmental conditions in winter and spring, while performance of all cultivars and experimental lines was most stable over summer.

Funding

Dairy Australia Limited

History

Publication title

Crop and Pasture Science

Volume

61

Issue

6

Pagination

493-502

ISSN

1836-0947

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

CSIRO Publishing

Place of publication

Australia

Rights statement

© CSIRO 2010

Repository Status

  • Restricted

Socio-economic Objectives

Lucerne

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    University Of Tasmania

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