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Acta Prataculturae Sinica ›› 2023, Vol. 32 ›› Issue (2): 110-118.DOI: 10.11686/cyxb2022238

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Variation in ear characteristics and estimation of photosynthetic contributions to oat ear development using techniques of ear shading and glume removal

Lu-ping WEI1,2,3(), Qing-ping ZHOU1,2,3, Fang LIU4, Ji-zhen LIN4, Yuan ZHAN1,2,3, Hui WANG1,2,3()   

  1. 1.Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station,Chengdu 610041,China
    2.Key Laboratory of Resistant Forage Germplasm Resource Exploration and Ecological Restoration of Degraded Grassland,Chengdu 610041,China
    3.Institute of Qinghai-Tibetan Plateau,Southwest Minzu University,Chengdu 610041,China
    4.National Animal Husbandry Service,Beijing 100126,China
  • Received:2022-05-30 Revised:2022-07-02 Online:2023-02-20 Published:2022-12-01
  • Contact: Hui WANG

Abstract:

Exploiting photosynthetic capacity of non-leaf organs such as the ear in cereals has received investigative attention, as the method of improving the whole photosynthetic capacity of crops has been investigated. In this study, six oat (Avena sativa) cultivars (Meida, Beile, Monika, Shezhengwang, Taike and Tianyan 60) were sown in Chengdu Plain in autumn. Two experimental treatments were set up, ear shading and glume removal, to compare the differences in ear characteristics, ear photosynthetic contribution rate, glume photosynthetic contribution and photosynthetic matter transfer rate in stem in the six oat varieties. It was found that the photosynthetic contribution of the ear to grain fill in the six oat varieties ranged from 28.56%-49.05% and Tianyan 60 (T60) had the highest contribution rate. The photosynthetic contribution of glumes ranged from 11.03%-36.88% and contribution of stored photosynthetic matter translocated from stems ranged from 6.65%-35.81%. The ear made the major photosynthetic contribution to grain fill. When ear photosynthesis was limited, the single seed weight and the seed numbers per ear were significantly decreased, especially the number of double seed spikelets.

Key words: oat, ear organs, photosynthetic contribution rate, ear characteristics, photosynthetic matter transfer rate in stem