rachis

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Related to rachises: rachial

rachis

[′rā·kəs]
(anatomy)
The vertebral column.
(biology)
An axial structure such as the axis of an inflorescence, the central petiole of a compound leaf, or the central cord of an ovary in Nematoda.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
[ha.sup.-1] of trinexapacethyl in single dose reduced by 74% the emergence of flower rachises in the period of 77 days (Baker et al., 1999).
The literature cites that Type-II growth inhibitors used in lawns, such as trinexapac-ethyl and prohexadione-calcium, are not very efficient at avoiding the emergence of flower rachises, because they interfere with the biosynthesis of gibberellins and, consequently, with the reduction of cell elongation (Mittlesteadt et al., 2009).
In rachises, costae and laminae scales and hairs are present (Fig.
Rachises scaly, papillate, aerophores occasional in the base of pinnae.
It has glabrous petioles and rachises and the pinnae are slightly decurrent on the rachis.
Flowers for the assessment of volatile emanation from intact inflorescences, florets and rachises were collected from tile cultivar Algonquin.
For the samples from the second experiment, half of the inflorescences were also immediately routed to the analyses, whereas in the other half the florets and rachises were immediately separated prior to beginning the analyses.
Dry matter in leaves, stems, and rachises is known to contribute to grain filling (Nicolas et al., 1985a,b; Zhu et al., 1988; Borrell et al., 1989; Kiniry, 1993), yet the amount of contribution may vary among the vegetative organs.
Panicle length, biomass at heading, LAI at heading, number of spikelets per panicle, number of primary rachises per panicle, leaf area per spikelet, and biomass per spikelet were assigned as third-order variables because of their hypothesized causal relationship with either number of grains per panicle or grain weight.