Morphological Studies on Tillering Habits in Temperate Herbage Grasses : V. Patterns of tillering and tiller bud development of some grasses under contrasting light regimes

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  • 寒地型イネ科牧草の分げつ習性に関する形態学的研究 : V. 異なる光条件下における数種イネ科牧草の分げつ発生と分げつ芽形成について
  • 寒地型イネ科牧草の分げつ習性に関する形態学的研究-5-異なる光条件下における数種イネ科牧草の分げつ発生と分げつ芽形成について〔英文〕
  • カンチガタ イネカ ボクソウ ノ ブンゲツ シュウセイ ニ カンスル ケイタイ

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Abstract

The patterns of tillering and tiller bud development were investigated anatomically on young seedlings of orchardgrass (Dactylis glomerata L.), timothy (Phleum pratense L.), tall fescue (Festuca arundinacea Schreb.), and reed canarygrass (Phalaris arundinacea L.) that were grown under both normal (30,000lux, =NL) and reduced (6,000lux, =RL) light intensities with constant day-night temperature (22°-18℃). Regular expansion of successive leaves along the axes of main shoot and emerged primary tillers were observed in each species, according to the leaf number interval "n-3" (orchardgrass and timothy) or "n-2" (tall fescue and reed canarygrass). The visible synchronization in expansion of any corresponding leaf on main shoot and emerged tillers seemed to be the consequence of their simultaneous initiation and analogous development progressing at the subapical regions of shoots. The course of tiller bud development of grasses examined was considered to consist of two different morphogenetic phases. The first was the process from the initiation of tiller bud primordium to the completion of bud structure, and the second was the rapid elongation of the tiller bud which had just completed, though the latter phase appeared to be a little dissimilar in reed canarygrass. The basic structure as a tiller bud was generally achieved immediately after the full expansion of the subtending leaf of mother shoot in every grass examined. Then the tiller bud elongation commenced without any intermission and terminated with leaf emergence under normal daylight condition. The course of this phase was, however, inhibited so strongly under reduced daylight conditions, that the completed tiller buds ceased further growth and regular tillering was disturbed.

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