Abstract
Shortage of C assimilate supply to rice grain during approximately the first 10 days after heading (DAY10) has been believed to reduce potentiality of grain dry matter increase (G(P)) and decrease the final grain weight (G(F)). However, we suspect that assimilate shortage during DAY10 does not determine G(F), if assimilate supply during the rest of the grain filling period (G(PERIOD)) meets subsequent requirements for realizing G(P). Our objective was to determine if G(P) is in fact affected by shortage of assimilate supply caused by shading during DAY10. Plots of rice (Oryza sativa L.) grown under paddy field conditions were subjected to three strengths of shading for DAY10. After the shades were removed, the plots were divided into two groups. Plants in the first group were thinned to half the plant population density, while the second group was left at normal spacing. G(F) in the unthinned group was reduced depending on the strength of the shade, but weights in the thinned group almost reached those of nonshaded control plants, except in the most heavily shaded plots, where weights were slightly reduced. In pot experiments simulating crop stand, G(F) all reached these of control plants when the pots were exposed to abundant radiation after being subjected to heavy shading during either the early or mid-G(PERIOD). These results suggest that rice plants are capable of recovering from early reduction in grain growth rate at least until the mid-G(PERIOD), and shortage of available assimilate during DAY10 does not determine G(P).
| Original language | English |
|---|---|
| Pages (from-to) | 411-417 |
| Number of pages | 7 |
| Journal | Agronomy Journal |
| Volume | 92 |
| Issue number | 3 |
| Publication status | Published - May 1 2000 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Agronomy and Crop Science
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Shading during the early grain filling period does not affect potential grain dry matter increase in rice. / Kobata, Toru; Sugawara, Makoto; Takatu, Sadanori.
In: Agronomy Journal, Vol. 92, No. 3, 01.05.2000, p. 411-417.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Shading during the early grain filling period does not affect potential grain dry matter increase in rice
AU - Kobata, Toru
AU - Sugawara, Makoto
AU - Takatu, Sadanori
PY - 2000/5/1
Y1 - 2000/5/1
N2 - Shortage of C assimilate supply to rice grain during approximately the first 10 days after heading (DAY10) has been believed to reduce potentiality of grain dry matter increase (G(P)) and decrease the final grain weight (G(F)). However, we suspect that assimilate shortage during DAY10 does not determine G(F), if assimilate supply during the rest of the grain filling period (G(PERIOD)) meets subsequent requirements for realizing G(P). Our objective was to determine if G(P) is in fact affected by shortage of assimilate supply caused by shading during DAY10. Plots of rice (Oryza sativa L.) grown under paddy field conditions were subjected to three strengths of shading for DAY10. After the shades were removed, the plots were divided into two groups. Plants in the first group were thinned to half the plant population density, while the second group was left at normal spacing. G(F) in the unthinned group was reduced depending on the strength of the shade, but weights in the thinned group almost reached those of nonshaded control plants, except in the most heavily shaded plots, where weights were slightly reduced. In pot experiments simulating crop stand, G(F) all reached these of control plants when the pots were exposed to abundant radiation after being subjected to heavy shading during either the early or mid-G(PERIOD). These results suggest that rice plants are capable of recovering from early reduction in grain growth rate at least until the mid-G(PERIOD), and shortage of available assimilate during DAY10 does not determine G(P).
AB - Shortage of C assimilate supply to rice grain during approximately the first 10 days after heading (DAY10) has been believed to reduce potentiality of grain dry matter increase (G(P)) and decrease the final grain weight (G(F)). However, we suspect that assimilate shortage during DAY10 does not determine G(F), if assimilate supply during the rest of the grain filling period (G(PERIOD)) meets subsequent requirements for realizing G(P). Our objective was to determine if G(P) is in fact affected by shortage of assimilate supply caused by shading during DAY10. Plots of rice (Oryza sativa L.) grown under paddy field conditions were subjected to three strengths of shading for DAY10. After the shades were removed, the plots were divided into two groups. Plants in the first group were thinned to half the plant population density, while the second group was left at normal spacing. G(F) in the unthinned group was reduced depending on the strength of the shade, but weights in the thinned group almost reached those of nonshaded control plants, except in the most heavily shaded plots, where weights were slightly reduced. In pot experiments simulating crop stand, G(F) all reached these of control plants when the pots were exposed to abundant radiation after being subjected to heavy shading during either the early or mid-G(PERIOD). These results suggest that rice plants are capable of recovering from early reduction in grain growth rate at least until the mid-G(PERIOD), and shortage of available assimilate during DAY10 does not determine G(P).
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UR - http://www.scopus.com/inward/citedby.url?scp=0034117254&partnerID=8YFLogxK
M3 - Article
VL - 92
SP - 411
EP - 417
JO - Agronomy Journal
JF - Agronomy Journal
SN - 0002-1962
IS - 3
ER -