Abstract
In order to elucidate the changes of agronomic traits during genetic improvement,23 typical indica hybrid rice combinations applied in the production in the middle and lower reaches of the Yangtze River during the last 30 years were used.All the hybrid rice combinations were grown in the same field,yield and morphological characters of single plant were compared,and correlation and path analyses among agronomic characteristics were conducted.During the 30 years of genetic improvement,the effective panicle number per plant was progressively decreased,which caused the decrease of grain yield and biomass per plant of hybrid rice combinations in spite of the slightly increased plant height,1000-grain weight and number of grains per panicle.Although the transformation percentage of the matter in stem and sheath decreased after flowering,leaf photosynthetic capacity after flowering increased as well as panicle weight.Correlation and path analyses showed that although both biomass per plant and number of grains per panicle were significantly correlated with grain yield per plant,biomass per plant acted as the key factor affecting yield per plant.It is suggested that in rice high yield cultivation,panicle number was as important as large panicle,and tillering ability should not be neglected in breeding.
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Claims 12
Claim · model-written summary
Effective panicle number per plant of indica hybrid rice progressively decreased during 30 years of genetic improvement.
Verbatim
t0“Changes in Agronomic Traits of Indica Hybrid Rice during Genetic Improvement”
e1“During the 30 years of genetic improvement,the effective panicle number per plant was progressively decreased,which caused the decrease of grain yield and biomass per plant of hybrid rice combinations in spite of the slightly increased plant height,1000-grain weight and number of grains per panicle”
Claim · model-written summary
Grain yield per plant of indica hybrid rice decreased during 30 years of genetic improvement.
Verbatim
t0“Changes in Agronomic Traits of Indica Hybrid Rice during Genetic Improvement”
e1“During the 30 years of genetic improvement,the effective panicle number per plant was progressively decreased,which caused the decrease of grain yield and biomass per plant of hybrid rice combinations in spite of the slightly increased plant height,1000-grain weight and number of grains per panicle”
Claim · model-written summary
Biomass per plant of indica hybrid rice decreased during 30 years of genetic improvement.
Verbatim
t0“Changes in Agronomic Traits of Indica Hybrid Rice during Genetic Improvement”
e1“During the 30 years of genetic improvement,the effective panicle number per plant was progressively decreased,which caused the decrease of grain yield and biomass per plant of hybrid rice combinations in spite of the slightly increased plant height,1000-grain weight and number of grains per panicle”
Claim · model-written summary
Plant height, 1000-grain weight and number of grains per panicle of indica hybrid rice slightly increased during genetic improvement.
Verbatim
t0“Changes in Agronomic Traits of Indica Hybrid Rice during Genetic Improvement”
e1“During the 30 years of genetic improvement,the effective panicle number per plant was progressively decreased,which caused the decrease of grain yield and biomass per plant of hybrid rice combinations in spite of the slightly increased plant height,1000-grain weight and number of grains per panicle”
Claim · model-written summary
Transformation percentage of matter in stem and sheath of indica hybrid rice decreased after flowering.
Verbatim
t0“Changes in Agronomic Traits of Indica Hybrid Rice during Genetic Improvement”
e2“Although the transformation percentage of the matter in stem and sheath decreased after flowering”
Claim · model-written summary
Leaf photosynthetic capacity of indica hybrid rice increased after flowering.
Verbatim
t0“Changes in Agronomic Traits of Indica Hybrid Rice during Genetic Improvement”
e3“leaf photosynthetic capacity after flowering increased as well as panicle weight”
Claim · model-written summary
Panicle weight of indica hybrid rice increased over the genetic improvement series.
Verbatim
t0“Changes in Agronomic Traits of Indica Hybrid Rice during Genetic Improvement”
e3“leaf photosynthetic capacity after flowering increased as well as panicle weight”
Claim · model-written summary
Biomass per plant was significantly correlated with grain yield per plant in indica hybrid rice.
Not reportedDirection
Verbatim
t0“Changes in Agronomic Traits of Indica Hybrid Rice during Genetic Improvement”
e4“although both biomass per plant and number of grains per panicle were significantly correlated with grain yield per plant”
e6“All the hybrid rice combinations were grown in the same field”
Claim · model-written summary
Number of grains per panicle was significantly correlated with grain yield per plant in indica hybrid rice.
Not reportedDirection
Verbatim
t0“Changes in Agronomic Traits of Indica Hybrid Rice during Genetic Improvement”
e4“although both biomass per plant and number of grains per panicle were significantly correlated with grain yield per plant”
e6“All the hybrid rice combinations were grown in the same field”
Claim · model-written summary
Biomass per plant was the key factor affecting yield per plant of indica hybrid rice, according to path analysis.
Not reportedDirection
Verbatim
t0“Changes in Agronomic Traits of Indica Hybrid Rice during Genetic Improvement”
e5“biomass per plant acted as the key factor affecting yield per plant”
e6“All the hybrid rice combinations were grown in the same field”
Claim · model-written summary
Panicle number is as important as large panicle in rice high-yield cultivation.
- Taxon
- rice
Oryza sativae7 - Outcome
- panicle number was as important as large paniclee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“It is suggested that in rice high yield cultivation,panicle number was as important as large panicle,and tillering ability should not be neglected in breeding”
Claim · model-written summary
Tillering ability should not be neglected in rice breeding.
- Taxon
- riceOryza sativae7
- Outcome
- tillering ability should not be neglected in breedinge7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“It is suggested that in rice high yield cultivation,panicle number was as important as large panicle,and tillering ability should not be neglected in breeding”