NDLI: The Relationship between Dry Matter Increase of Seed and Shoot during the Seed-Filling Period in Three Kinds of Soybeans with Different Growth Habits Subjected to Shading and Thinning

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The Relationship between Dry Matter Increase of Seed and Shoot during the Seed-Filling Period in Three Kinds of Soybeans with Different Growth Habits Subjected to Shading and Thinning

Content Provider	Taylor & Francis Online
Author	Kakiuchi, Jin Kobata, Tohru
Abstract	The ratio of dry-matter increase in seed (S) to that in shoot (W), referred to as Rs/W, during the seed-filling period may reflect the balance between the assimilate supply and the sink capacity of harvest organs. In the determinate soybean, cv. Tamahomare, Rs/W during the seed-filling period was nearly the same under various growing conditions including shading and thinning of plants. Therefore, the S in the determinate soybean seems to correlate with the W under various conditions. However, the correlation of the S with the W in indeterminate soybeans in which shoot growth continues during the seed-filling period is unknown. In this study, three soybean cultivars [Glycine max (L.) Merr.], Tamahomare (determinate), Tozan69 (indeterminate) and Peking (semi-indeterminate), were grown under shading and thinning conditions during the seed-filling period. The Rs/w approximated a positive linear regression in the three cultivars. Rs/w was approximately 0.5 in each cultivar. Positive correlations were observed between W and S, pod number or total node number in all cultivars. However, the seed number per pod and individual seed weight were not significantly influenced either by shading or thinning in any cultivar. Hence the rate of partition of assimilate to seeds seems to be determined by pod number. Harvest index was stable except when W was extremely low as when plants were heavily shaded. Our results suggested that the Rs/w, harvest index and the yield-determining processes of the determinate and the indeterminate soybeans are fundamentally the same.
Starting Page	20
Ending Page	26
Page Count	7
File Format	PDF HTM / HTML
ISSN	1343943X 13491008
DOI	10.1626/pps.9.20
Journal	Plant Production Science
Volume Number	9
Issue Number	1
Language	English
Publisher	Taylor & Francis
Publisher Date	2015-12-03
Access Restriction	Open
Subject Keyword	Determinate Dry matter Harvest Index Indeterminate Soybean
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science

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