Contribution of Biomass Partitioning and Translocation to Grain Yield under Sub-Optimum Growing Conditions in Irrigated Rice
By M. Laza, S. Peng, S. Akita, H. Saka. 2003
102 citations recorded by the source corpus.
Abstract The International Rice Research Institute (IRRI) has developed a new plant type (NPT) and Ft hybrids to further increase rice yield potential. In this study we compared yield and yield-related traits among four genotypic groups : indica inbreds, F[ hybrids, NPT and NPT X indica lines; and determined the contribution of biomass partitioning and translocation to grain yield under sub-optimum growing conditions. Field experiments were conduct¬ed in 1998 wet season (WS) and 1999 dry seasons (DS) in the Philippines. Forty-seven genotypes in the WS and 46 genotypes in the DS were studied. Growth analyses were done at flowering and physiological maturity and yield, and yield components were measured at physiological maturity. Among the genotypic groups, average grain yield of the Fj hybrids was the highest and that of the NPT lines was the lowest. Grain yield was highly associated with harvest index (HI) with an r2 of 0.73-0.84 in both seasons. The relationship between grain yield and biomass production was relatively weak. A negative relationship was observed between T,the amount of biomass accumulated before flowering and translocated to the grains during grain filling and Wr the biomass accumulation from flowering to physiological maturity. The NPT lines had the highest average Wrbut had the lowest Tamong the genotypic groups, which was opposite of that of the Fj hybrids. Compared to Wr, Twas more closely related to HI and grain yield. Results suggest that under sub-optimum growing conditions such as low total solar radiation increasing Tand HI is vital for achieving high actual grain yield in irrigated rice
Subfields: Plant Science
View Paper: https://www.semanticscholar.org/paper/304b0a4d228352872ca910a19518006f96f5a26c
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In Plant Science
Citations in the corpus
- Higher crop performance of rice hybrids than of elite inbreds in the tropics: 1. Hybrids accumulate more biomass during each phenological phase (2009, background): “Even a negative relationship during grain filling has been reported between biomass accumulation and biomass remobilization (Laza et al., 2003).”
- Progress in ideotype breeding to increase rice yield potential (2008, background): “…NPT lines was attributed to low harvest index, which was the result of small sink size (i.e., few spikelets per m2), low grain-filling percentage, and poor translocation of biomass accumulated before flowering to the grains during grain filling (Laza et al., 2003; Peng et al., 2004).”