Trejo, Carlos, Else, Mark A. and Atkinson, Christopher J. (2018) Responses of seminal wheat seedling roots to soil water deficits. Journal of Plant Physiology, 223. pp. 105-114. ISSN 0176-1617 (doi:https://doi.org/10.1016/j.jplph.2018.03.002)

Preview	PDF (Author Accepted Manuscript) 19374 ATKINSON_Responses_of_Seminal_Wheat seedling_Roots_to_Soil_Water_Deficits_[1].pdf - Accepted Version Download (743kB) | Preview
Preview	PDF (Author Accepted Manuscript - Version) 19374 ATKINSON_Responses_of_Seminal_Wheat_Seedling_Roots_to_Soil_Water_Deficits_2018_[2].pdf - Accepted Version Download (896kB) | Preview
	PDF (Acceptance Email) 19374 ATKINSON_Acceptance_Email_2018.pdf - Additional Metadata Restricted to Repository staff only Download (103kB)

Abstract

The aims of this paper are to develop our understanding of the ways by which soil water deficits influence early wheat root growth responses, particularly how seminal roots respond to soil drying and the extent to which information on differences in soil water content are conveyed to the shoot and their impact on shoot behaviour. To achieve this, wheat seedlings have been grown, individually for around 25 days after germination in segmented soil columns within vertical plastic compartments. Roots were exposed to different soil volumetric moisture contents (SVMC) within the two compartments. Experiments where the soil in the lower compartment was allowed to dry to different extents, while the upper was maintained close to field capacity, showed that wheat seedlings allocated proportionally more root dry matter to the lower drier soil compartment. The total production of root, irrespective of the upper or lower SVMC, was similar and there were no detected effects on leaf growth rate or gas exchange. The response of seminal roots to proportionally increase their allocation of dry matter, to the drier soil was unexpected with such plasticity of roots system development traditionally linked to heterogeneous nutrient distribution than accessing soil water. In experiments where the upper soil compartment was allowed to dry, root growth slowed and leaf growth and gas exchange declined. Subsequent experiments used root growth rates to determine when seminal root tips first came into contact with drying soil, with the intentions of determining how the observed root growth rates were maintained as an explanation for the observed changes in root allocation. Measurements of seminal root ABA and ethylene from roots within the drying soil are interpreted with respect to what is known about the physiological control of root growth in drying soil.

Item Type:	Article
Uncontrolled Keywords:	Abscisic acid; Ethylene; Seminar roots; Soil water deficits; Wheat; Abscisic acid; Ethylene; Seminar roots; Soil water deficits; Wheat; Abscisic acid; Ethylene; Seminar roots; Soil water deficits; Wheat
Subjects:	S Agriculture > S Agriculture (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > Natural Resources Institute Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
Last Modified:	13 Jun 2019 11:06
URI:	http://gala.gre.ac.uk/id/eprint/19374

Actions (login required)

View Item

Downloads