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How does pea architecture influence light sharing in virtual wheat–pea mixtures? A simulation study based on pea genotypes with contrasting architectures

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Abstract.
Background and aims:
Light interception is a key factor driving the functioning of wheat–pea intercrops. The sharing
of light is related to the canopy structure, which results from the architectural parameters of
the mixed species. In the present study, we characterized six contrasting pea genotypes and
identified architectural parameters whose range of variability leads to various levels of light
sharing within virtual wheat–pea mixtures.

Methodology:
Virtual plants were derived from magnetic digitizations performed during the growing cycle in
a greenhouse experiment. Plant mock-ups were used as inputs of a radiative transfer model in
order to estimate light interception in virtual wheat–pea mixtures. The turbid medium approach,
extended to well-mixed canopies, was used as a framework for assessing the
effects of leaf area index (LAI) and mean leaf inclination on light sharing.

Principal results:
Three groups of pea genotypes were distinguished: (i) early and leafy cultivars, (ii) late semileafless
cultivars and (iii) low-development semi-leafless cultivars. Within open canopies, light
sharing was well described by the turbid medium approach and was therefore determined by
the architectural parameters that composed LAI and foliage inclination. When canopy closure
started, the turbid medium approach was unable to properly infer light partitioning because
of the vertical structure of the canopy. This was related to the architectural parameters that
determine the height of pea genotypes. Light capture was therefore affected by the development
of leaflets, number of branches and phytomers, as well as internode length.

Conclusions:
This study provides information on pea architecture and identifies parameterswhose variability can
be used to drive light sharingwithinwheat–peamixtures. These results could be used to build up the
architecture of pea ideotypes adapted to multi-specific stands towards light competition.

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Informasi Detail

Judul Seri

AoB PLANTS

No. Panggil

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Penerbit

Oxford : Oxford University Press on behalf of the Annals of Botany Company., 2012

Deskripsi Fisik

AoB PLANTS 2012: pls038; doi:10.1093/aobpla/pls038

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

2012: pls038

Subjek

PEMULIAAN TANAMAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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