Variation in the Determination of Leaf, Spikelet and Floret Number on the Main Stem of Wheat with Sowing Dates

Toyota, Masanori; Kobayashi, Yasuhiko; Miyoshi, Yukari; YASUMURA, Naoko; Kusutani, Akihito; Asanuma, Koh-ichiro

doi:10.1626/jcs.73.10

Cited by 2 publications

(1 citation statement)

References 28 publications

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“…Stern and Kirby (1979) showed that the rate of spikelet initiation increased and the duration decreased with later sowing. Our previous study showed that the rate of initiation in leaf decreased, but that in spikelet increased, and the duration of spikelet initiation phase decreased by the delay of sowing (Toyota et al, 2004).…”

Section: Convergent Development To Headingmentioning

confidence: 92%

Morphological and phenological adaptation for convergent development of tillers in Widely spaced wheat sown on different dates

Toyota

Morokuma

2020

Plant Production Science

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This study analyzes the dynamics of leaf and tiller emergence and development of widely spaced wheat sown on different dates. We used the phyllochron (time interval between the emergence of successive leaves at the same stage), site filling (the relative rate of increase in the number of tillers per phyllochron), and indices associated with 'the synchronous growth'. Number of productive tillers per plant (including the main shoot, MS) reached 45.7 in early sowing, and significantly decreased by the delay in sowing. The increase in tiller number with the elapse of leaf age (Haun stage) of MS (HS ms ) was almost the same as that expected from synchronous growth until HS ms 8.6 and site filling before this HS ms was close to 0.481. The phyllochron was shortest in MS and increased in axillary tillers with increasing tiller order and position, but the differences in phyllochron between MS and axillary tillers within a plant were significant only at higher order and positions of tillers. The time of emergence of tillers was always advanced in comparison with that expected from synchronous growth. A very close negative linear relationship was found between the number of days from emergence to heading of tillers and the time of their emergence expressed as day of year; this relationship was independent of the tiller order, position and sowing date. Although the phyllochron gradually became longer, a progressive decrease of the leaf and spikelet per spike with the increasing tiller order and position may contribute considerably to the convergence to heading time.

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Section: Convergent Development To Headingmentioning

confidence: 92%

Morphological and phenological adaptation for convergent development of tillers in Widely spaced wheat sown on different dates

Toyota

Morokuma

2020

Plant Production Science

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Physiological performance of iron-coated primed rice seeds under submerged conditions and the stimulation of coleoptile elongation in primed rice seeds under anoxia

Mori

Fujimoto

Watanabe

et al. 2012

Soil Science and Plant Nutrition

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Although seed priming is well known to be an effective method for enhancing seed vigor and seed performance, the efficacy of priming (soaking in water and re-drying) on the physiological performance of iron-coated rice (Oryza sativa L.) seeds under submerged conditions, and the physiological mechanisms of coleoptile elongation of the primed rice seeds under anoxia, have not been well elucidated. In the present study, primed and unprimed rice seeds with or without iron-coating were produced. We examined the physiological performance of these rice seeds and the physiological efficacy of priming on coleoptile elongation under anoxia. For the primed rice seeds, seed germination, coleoptile elongation, seedling emergence and the establishment of iron-coated rice seeds all improved considerably, which resulted in an increase of plant height and dry weight for the iron-coated primed rice seeds. Increases in -amylase activity and glucose concentration over time were significantly higher in the primed rice seeds than in the unprimed rice seeds. Under anoxia, the -amylase activity and soluble sugar concentration were significantly higher in the primed rice seeds than in the unprimed rice seeds. The glucose and fructose concentrations in the coleoptiles were significantly higher in the primed rice seeds than in the unprimed rice seeds, suggesting that the stimulated coleoptile elongation is partly related to the increased availability of soluble sugar from the seed to the coleoptiles. The increased availability of soluble sugar from the rice seeds to the coleoptiles can be assumed to help maintain glycolytic flux and alcoholic fermentation under the submerged conditions. These results clearly indicate the efficacy of priming on iron-coated rice seeds, and that the coleoptile elongation of the primed rice seeds can be partly ascribed to the sugar availability from the rice seeds to the coleoptiles. Therefore, the use of primed rice seeds for iron coating is highly effective to induce the emergence and establishment of stable seedlings in direct rice sowing systems.

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Variation in the Determination of Leaf, Spikelet and Floret Number on the Main Stem of Wheat with Sowing Dates

Cited by 2 publications

References 28 publications

Morphological and phenological adaptation for convergent development of tillers in Widely spaced wheat sown on different dates

Morphological and phenological adaptation for convergent development of tillers in Widely spaced wheat sown on different dates

Physiological performance of iron-coated primed rice seeds under submerged conditions and the stimulation of coleoptile elongation in primed rice seeds under anoxia

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