NDLI: Root lodging tolerance in Helianthus annuus (L.): associations with morphological and mechanical attributes of roots

Content Provider	Springer Nature Link
Author	Manzur, M. E. Hall, A. J. Chimenti, C. A.
Copyright Year	2014
Abstract	The objectives of this study were to quantify the morphological and mechanical properties of the root-plate within two sunflower hybrids of contrasting susceptibility to root lodging; and to evaluate the effects of crop population density on these properties at two different development stages.Two hybrids (CF29: tolerant, Zenit: sensitive) were grown at three densities: 5.6, 10 and 16 plants m$^{−2}$. At R2 (early reproductive) and R6 (end anthesis) development stages, plants were artificially lodged and stem biomass, total root biomass in the whole root-plate and in the 0–5 and >5 cm layers of the plate, root number (three diametrical categories: 0–1, 1.1–2, >2 mm), total root length, and root axial breakage force were assessed.CF29 root mass was twice that of Zenit with differences mainly in the top 5 cm of soil. This higher root-plate biomass of CF29 was associated with a greater root number and root length compared to Zenit within all root diameter categories. Roots of CF29 exhibited higher axial tension failure thresholds than those of Zenit, and these thresholds increased more sharply with root diameter in CF29 than in Zenit.The better anchorage and tolerance to lodging of CF29 with respect to Zenit arose from additive actions of traits at both whole root-plate and individual root levels. These included total root-plate root length, root number, root biomass and root axial breakage force.
Starting Page	71
Ending Page	83
Page Count	13
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	381
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-04-21
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Crop population density Ontogenetic stages Root-plate biomass Root-plate diameter Root length Root number Root axial breakage force Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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