Intraspecific variation in sensitivity to ultraviolet-B radiation in maize grown under field conditions. I. Growth and morphological aspects

This study was conducted to determine the growth and morphological effects of UV-B on 8 cultivars of maize ( Zea mays L.) in a Mediterranean climate. Dry weight, leaf area, leaf area duration (LAD), ear length, mean relative growth rate (RGR), and mean net assimilation rate (NAR) were significantly...

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Bibliographic Details
Published in:Field crops research 1998-11, Vol.59 (2), p.81-89
Main Authors: C.M, Correia, E.L.V, Areal, M.S, Torres-Pereira, J.M.G, Torres-Pereira
Format: Article
Language:English
Subjects:
biological resistance
corn ears
cultivars
dry matter
dry matter partitioning
duration
field experimentation
growth
Growth analysis
growth rate
height
leaf area
leaves
length
Maize
net assimilation rate
plant characteristics
plant morphology
senescence
Sensitivity ranking
stems
ultraviolet radiation
UV-B radiation
weight
Zea mays
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Summary:This study was conducted to determine the growth and morphological effects of UV-B on 8 cultivars of maize ( Zea mays L.) in a Mediterranean climate. Dry weight, leaf area, leaf area duration (LAD), ear length, mean relative growth rate (RGR), and mean net assimilation rate (NAR) were significantly reduced by UV-B treatment in some cultivars. Plant height and number of leaves were not affected. Changes in partitioning of biomass and premature leaf senescence were also recorded. Considerable variation in UV-B sensitivity exists within cultivars. DK 498 was the most sensitive and REG.VR the least sensitive. These genotypic differences suggest that future attempts at breeding for increased tolerance to UV-B radiation might be successful.
ISSN:0378-4290
1872-6852
DOI:10.1016/S0378-4290(98)00102-6