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Morphological studies on tillering habits in temperate herbage grasses 1. the regularity of tiller and tiller bud development of orchard grass seedlings growth under favorable conditions



Morphological studies on tillering habits in temperate herbage grasses 1. the regularity of tiller and tiller bud development of orchard grass seedlings growth under favorable conditions



Grassland Science 28(1): 65-73



The formation and developmental pattern of tillers and tiller buds of orchard grass seedlings, grown under favorable conditions, was investigated anatomically. The appearance of leaf n (numbered acropetally) of the mother shoot synchronized with that of 1st leaf of tiller Tn-3 which was subtended by leaf n-3, so that most of the tillers appearing in this manner produced corresponding leaves at almost constant intervals. This phenomenon is supported by Katayama's concept (Katayama, 1951) of tillering systems in cereal crops. In addition to the tillering regularity, the corresponding leaves, either expanded or expanding, of different tillers were similar in length to each other as in cereal crops. The primordia of corresponding leaves of the main shoot and emerged primary tillers were initiated almost simultaneously and subsequent developments progressed analogously. The externally visible synchronism in the appearance of any corresponding leaf of each emerged tiller may result from its simultaneous initiation and analogous development occurring at the subapical regions. During the tiller bud development, the initiation of successive leaves at the shoot apices of buds proceeded more quickly than that of emerged tillers. The developmental course in tiller bud growth is apparently composed of 2 different morphogenetic phases. The 1st part, defined as the phase of tiller bud formation, is the process from the initiation of the primordial bulge of the tiller bud to the completion of bud structure. The structure of tiller bud bearing its own shoot apex and 3-4 juvenile leaves is achieved immediately after its subtending leaf n has just fully expanded on the mother shoot. The 2nd part of the developmental course starts with rapid elongation of 1st leaf of tiller bud Tn being subtended by the leaf n and concludes with the tip emergence of the tiller from subtending leaf sheath. This is defined as the phase of tiller bud elongation.

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