Abstract
Abstract. Current opinion is divided on whether the free IAA in cereal shoots is derived from the coleoptile tip or from the grain. To date these hypotheses have been considered to be mutually exclusive. In this paper the idea is advanced that both sources may function in the supply of IAA in the shoot. Critical review of the literature shows that such an explanation best fits all the available evidence. It is argued that the relative importance of each source may vary between species of the Gramineae, with the supply of IAA in Avena shoots being derived predominantly from the grain, whereas in Zea the coleoptile tip is the more important source.
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Claims 4
Claim · model-written summary
Both grain and coleoptile tip may supply IAA in shoots.
Verbatim
e0“both sources may function in the supply of IAA in the shoot”
e1“cereal shoots”
t0“Grain or coleoptile tip”
Claim · model-written summary
The two-source explanation best fits available evidence.
Verbatim
e0“such an explanation best fits all the available evidence”
e1“cereal shoots”
Claim · model-written summary
In Avena, grain is argued to be the predominant source of shoot IAA.
AvenaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the supply of IAA in Avena shoots being derived predominantly from the grain”
Claim · model-written summary
In Zea, coleoptile tip is argued to be the more important IAA source.
ZeaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas in Zea the coleoptile tip is the more important source”
e1“the supply of IAA in Avena shoots”