Abstract
The relationship between seed and shoot dry matter increase (R S/W) during the seed-filling period (SFP) can reflect the balance between the assimilate supply and the sink capacity of harvest organs. In a 2-yr experiment, the RS/W in determinate soybean [Glycine max (L.) Merr.] during SFP was investigated under various growing conditions induced by shading and thinning for plants grown under both standard and reduced densities. The RS/W approximated a positive linear regression in both experiments. Slopes of the lines were less than 0.5 and did not vary within the same year even if plant density was reduced. The shoot dry matter increase (W) hence seemed to directly determine seed dry matter increase (S). A positive relationship between total pod number and W or S was observed in both years. Only minimal changes in seed numbers per pod and individual seed weight were observed, regardless of the treatment applied. A positive relationship also existed between total pod number and the number of branch nodes, and hence W increased S via increase in the number of branch node bearing pods. Half the current assimilate product during SFP appeared to be used for increase of vegetative plant parts. This determined total pod number and hence potential S. Determinate soybean is thus very different from cereal crops, In which almost all the current assimilate during the SFP is appropriated to S. The stability of the harvest index in soybean reflects the important effect of the W on pod establishment during SFP.
| Original language | English |
|---|---|
| Pages (from-to) | 398-405 |
| Number of pages | 8 |
| Journal | Agronomy Journal |
| Volume | 96 |
| Issue number | 2 |
| Publication status | Published - May 1 2004 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Agronomy and Crop Science
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Shading and thinning effects on seed and shoot dry matter increase in determinate soybean during the seed-filling period. / Kakiuchi, Jin; Kobata, Toru.
In: Agronomy Journal, Vol. 96, No. 2, 01.05.2004, p. 398-405.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Shading and thinning effects on seed and shoot dry matter increase in determinate soybean during the seed-filling period
AU - Kakiuchi, Jin
AU - Kobata, Toru
PY - 2004/5/1
Y1 - 2004/5/1
N2 - The relationship between seed and shoot dry matter increase (R S/W) during the seed-filling period (SFP) can reflect the balance between the assimilate supply and the sink capacity of harvest organs. In a 2-yr experiment, the RS/W in determinate soybean [Glycine max (L.) Merr.] during SFP was investigated under various growing conditions induced by shading and thinning for plants grown under both standard and reduced densities. The RS/W approximated a positive linear regression in both experiments. Slopes of the lines were less than 0.5 and did not vary within the same year even if plant density was reduced. The shoot dry matter increase (W) hence seemed to directly determine seed dry matter increase (S). A positive relationship between total pod number and W or S was observed in both years. Only minimal changes in seed numbers per pod and individual seed weight were observed, regardless of the treatment applied. A positive relationship also existed between total pod number and the number of branch nodes, and hence W increased S via increase in the number of branch node bearing pods. Half the current assimilate product during SFP appeared to be used for increase of vegetative plant parts. This determined total pod number and hence potential S. Determinate soybean is thus very different from cereal crops, In which almost all the current assimilate during the SFP is appropriated to S. The stability of the harvest index in soybean reflects the important effect of the W on pod establishment during SFP.
AB - The relationship between seed and shoot dry matter increase (R S/W) during the seed-filling period (SFP) can reflect the balance between the assimilate supply and the sink capacity of harvest organs. In a 2-yr experiment, the RS/W in determinate soybean [Glycine max (L.) Merr.] during SFP was investigated under various growing conditions induced by shading and thinning for plants grown under both standard and reduced densities. The RS/W approximated a positive linear regression in both experiments. Slopes of the lines were less than 0.5 and did not vary within the same year even if plant density was reduced. The shoot dry matter increase (W) hence seemed to directly determine seed dry matter increase (S). A positive relationship between total pod number and W or S was observed in both years. Only minimal changes in seed numbers per pod and individual seed weight were observed, regardless of the treatment applied. A positive relationship also existed between total pod number and the number of branch nodes, and hence W increased S via increase in the number of branch node bearing pods. Half the current assimilate product during SFP appeared to be used for increase of vegetative plant parts. This determined total pod number and hence potential S. Determinate soybean is thus very different from cereal crops, In which almost all the current assimilate during the SFP is appropriated to S. The stability of the harvest index in soybean reflects the important effect of the W on pod establishment during SFP.
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M3 - Article
VL - 96
SP - 398
EP - 405
JO - Agronomy Journal
JF - Agronomy Journal
SN - 0002-1962
IS - 2
ER -