Grain yield of rice cultivars and lines developed in the Philippines since 1966

By S. Peng, R. Laza, R. Visperas, A. L. Sanico, K. Cassman, G. Khush. 2000

284 citations recorded by the source corpus.

Genetic improvement in grain yield has been intensively studied in wheat (Triticum aestivum L.), barley (Hordeum vulgare L.), oat (Avena sativa L.), maize (Zea mays L.), and soybean [Glycine max (L.) Merr.]. Such information is limited in rice (Oryza saliva L.). The objective of this study was to determine the trend in the yield of rice cultivars-lines developed since 1966. Twelve cultivars-lines were grown at the International Rice Research Institute (IRRI) farm and the Philippine Rice Research Institute farm during the dry season of 1996. Seven cultivars-lines were grown at IRRI farm in the dry season of 1998. Growth analyses were performed at key growth stages, and yield and yield components were determined at physiological maturity. Regression analysis of yield versus year of release indicated an annual gain in rice yield of 75 to 81 kg ha -1 , equivalent to 1% per year. The highest yields obtained with the most recently released cultivars was 9 to 10 Mg ha -1 , which is equivalent to reported yields of IR8 and other early IRRI cultivars obtained in the late 1960s and early 1970s at these same sites. Therefore, the 1% annual increase in yield may not represent genetic gain in yield potential. The increasing trend in yield of cultivars released before 1980 was mainly due to the improvement in harvest index (HI), while an increase in total biomass was associated with yield trends for cultivars-lines developed after 1980. Results suggest that further increases in rice yield potential will likely occur through increasing biomass production rather than increasing HI.

Subfields: Agronomy and Crop Science, Plant Science

View Paper: https://www.semanticscholar.org/paper/30344565f2db2c6be45f683c933635d1a6197228

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Citations in the corpus

Ltd Registered in England and Wales Registered Number : 1072954 Registered office : (2004, background): “Peng et al. (2000) reported that high yielding rice cultivars/lines developed at the IRRI from 1985 to 1995 were intermediate in canopy height, tillering capacity, and leaf area index.”
NITROGEN USE EFFICIENCY IN UPLAND RICE GENOTYPES (2010, background): “Peng et al. (2000) determined the trend in the yield of rice cultivars/lines developed since 1966 at the International Rice Research Institute (IRRI), Philippines.”
Grain Yield and Yield Attributes of New Plant Type and Hybrid Rice (2007, background): “Maximum grain yield of these indica inbred cultivars was also recorded as high as 10 t ha −1 in the tropical irrigated lowlands ( Peng et al., 2000 ).”
What it will take to Feed 5.0 Billion Rice consumers in 2030 (2005, background): “It is estimated that on the average about 1% increase has occurred per year in the yield potential of rice over a 35-year period since the development of first improved variety of rice IR8 (Peng et al., 2000).”
Yield Physiology of Rice (2007, background): “Peng et al. (2000) reported that yield improvement of lowland rice cultivars released by the International Rice Research Institute (IRRI) in the Philippines after 1980 was due to increases in biomass production.”
Breeding and Cereal Yield Progress (2010, background): “Changes in PY are difficult to assess in the current trials at IRRI, because older cultivars such as ‘IR8’, the first tropi cal semidwarf cultivar released in 1966, cannot now be easily protected from pests and diseases or may not be well adapted to recent unfavorable changes in the natural resource”