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Acta Prataculturae Sinica ›› 2023, Vol. 32 ›› Issue (1): 112-121.DOI: 10.11686/cyxb2022014

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Young spike differentiation and reproductive pattern of Bromus inermis in different habitats

Ying-xia CHEN(), Yu DU, Yu-xiang WANG(), Bo ZHANG(), Abduriherman ADILE   

  1. Key Laboratory of Grassland Resources and Ecology of Western Arid Region,Ministry of Education,Key Laboratory of Grassland Resources and Ecology of Xinjiang,College of Grassland Science,Xinjiang Agricultural University,Urumqi 830052,China
  • Received:2022-01-07 Revised:2022-03-03 Online:2023-01-20 Published:2022-11-07
  • Contact: Yu-xiang WANG,Bo ZHANG


In this study, we explored the effects of habitat on young spike differentiation and the reproductive pattern of Bromus inermis cv. Wusu No.1. We compared the process of young spike differentiation and flowering habits between plants in two growth environments: a desert oasis area and a high altitude area. The results showed that the young spike differentiation of B. inermis extended from the tillering stage to the heading stage, and could be divided into eight stages: the vegetative stage, elongation stage, single ridge stage, spikelet primordial stage, floret primordial stage, stamen primordial formation stage, stamen formation stage, and spike completion stage. Young spike differentiation started from the first branch primordium and floret primordium at the top of the growth cone. The primordia on the same branchlets and floret primordia developed from bottom to top. The flowering sequence of the whole spike was from top to bottom, and the flowering time was shorter on the lower branches than on the upper branches. The florets on the spikelets bloomed from bottom to top. Compared with the plants in the desert oasis area, those in the high altitude area differentiated young spikes later, had a shorter cycle, had higher contents of gibberellin, abscisic acid, and leaf soluble protein in the spike, lower cytokinin content and 1000-grain weight, and higher number of mature seeds per spike and seed yield per unit area. These results show that the high altitude area is more suitable for B. inermis seed production.

Key words: habitat, Bromus inermis, young spike, differentiation, reproductive pattern