Root morphology, water uptake, growth and survival of seedlings of ryegrass and Phalaris

Cornish, P. S., McWilliam, J. R. and So, H. B. (1984) Root morphology, water uptake, growth and survival of seedlings of ryegrass and Phalaris. Australian Journal of Agricultural Research, 35 4: 479-492. doi:10.1071/AR9840479


Author Cornish, P. S.
McWilliam, J. R.
So, H. B.
Title Root morphology, water uptake, growth and survival of seedlings of ryegrass and Phalaris
Journal name Australian Journal of Agricultural Research   Check publisher's open access policy
ISSN 0004-9409
Publication date 1984-01-01
Sub-type Article (original research)
DOI 10.1071/AR9840479
Open Access Status Not yet assessed
Volume 35
Issue 4
Start page 479
End page 492
Total pages 14
Language eng
Subject 1100 Agricultural and Biological Sciences
Abstract The development of secondary roots was prevented or delayed in ryegrass and phalaris, and the effects on plant water relations, growth and survival were studied in a controlled environment. Delayed development of secondary roots reduced transpiration within 15 days of emergence and reduced tillering and leaf area by the 22nd day in ryegrass and the 28th (leaf area) or 42nd day (tiller number) in phalaris. These effects were apparently due to high axial resistances to water flow through the plant, rather than to an inadequate capacity of the seminal roots for water uptake. Measurements of water flow through xylem vessels agreed well with predictions from the Poiseuille equation. Secondary roots were able to support seedlings from about 20 days after sowing in the absence of seminal roots, but most seedlings survived less than 4 months in the absence of secondary roots, even when subsoil water was available to the seminal roots. Delays in the establishment of secondary roots (up to 63 days) and phosphorus deficiency both reduced the number of secondary root axes forming, but this did not affect survival because the conductance of each secondary root axis was about two orders of magnitude higher than that of the seminal axis.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
 
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