Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 507028
Title Impact of anatomical traits of maize (Zea mays L.) leaf as affected by nitrogen supply and leaf age on bundle sheath conductance
Author(s) Retta, Moges; Yin, Xinyou; Putten, Peter E.L. van der; Cantre, Denis; Berghuijs, Herman N.C.; Ho, Quang Tri; Verboven, Pieter; Struik, Paul C.; Nicolaï, Bart M.
Source Plant Science 252 (2016). - ISSN 0168-9452 - p. 205 - 214.
DOI https://doi.org/10.1016/j.plantsci.2016.07.013
Department(s) Centre for Crop Systems Analysis
Crop Physiology
PE&RC
PPO/PRI AGRO Toegepaste Plantenecologie
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) C photosynthesis - Diffusive resistance - Image analysis - Microstructure - Nitrogen content
Abstract

The mechanism of photosynthesis in C4 crops depends on the archetypal Kranz-anatomy. To examine how the leaf anatomy, as altered by nitrogen supply and leaf age, affects the bundle sheath conductance (gbs), maize (Zea mays L.) plants were grown under three contrasting nitrogen levels. Combined gas exchange and chlorophyll fluorescence measurements were done on fully grown leaves at two leaf ages. The measured data were analysed using a biochemical model of C4 photosynthesis to estimate gbs. The leaf microstructure and ultrastructure were quantified using images obtained from micro-computed tomography and microscopy. There was a strong positive correlation between gbs and leaf nitrogen content (LNC) while old leaves had lower gbs than young leaves. Leaf thickness, bundle sheath cell wall thickness and surface area of bundle sheath cells per unit leaf area (Sb) correlated well with gbs although they were not significantly affected by LNC. As a result, the increase of gbs with LNC was little explained by the alteration of leaf anatomy. In contrast, the combined effect of LNC and leaf age on Sb was responsible for differences in gbs between young leaves and old leaves. Future investigations should consider changes at the level of plasmodesmata and membranes along the CO2 leakage pathway to unravel LNC and age effects further.

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