NDLI: Hydrotropism in lateral but not in pivotal roots of desert plant species under simulated natural conditions

Content Provider	Springer Nature Link
Author	Guevara, Aranzazú Giorda, Carla Valeria
Copyright Year	2014
Abstract	Root hydrotropism has been widely studied in seedling radicles through artificial experiments that reduce the influence of gravity and soil. In this work we aimed to study hydrotropism of primary lateral and pivotal roots in developed root systems of desert plants under simulated natural conditions.We grew Bulnesia retama Griseb. (non phreatophyte), Prosopis flexuosa DC. (facultative phreatophyte) and Prosopis alpataco Phil.(obligate phreatophyte) seedlings in observation boxes with sand. Lateral and pivotal roots were stimulated by lateral water gradients and hydrotropic responses, root proliferation and root : shoot ratios were measured.We found that 65 ± 15 % of lateral roots that grew in response to water gradients in B. retama, 84 ± 8 % in P. flexuosa and 88 ± 8 % in P. alpataco displayed hydrotropism. Conversely, pivotal roots did not show hydrotropic growth. This was accompanied by root proliferation inside water patches, and biomass partitioning to shoot growth.Our results provide evidence that root hydrotropism is a relevant response that could occur in nature. Lateral and pivotal roots manifest different hydrotropic responses under the conditions assayed. The combination of hydrotropism and precise root proliferation can shape root architecture, leading to optimum water patch exploration.
Starting Page	257
Ending Page	272
Page Count	16
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	389
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-12-17
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bulnesia retama Hydrotropism Prosopis alpataco Prosopis flexuosa Root proliferation R : S ratio Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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