벼 조기초관폐쇄성의 품종 변이 및 수량과의 관계 (Genotypic Variation of Rapid Canopy Closure and Its Relationship with Yield of Rice)

서지정보

· 발행기관 : 한국작물학회
· 수록지 정보 : 한국작물학회지 / 53권 / 2호 / 137 ~ 143페이지
· 저자명 : 부금동, 이변우

초록

Rapid canopy closure (RCC) is one of the
physiological attributes that may enhance genetic yield potential
of rice (Oryza sativa L.) in a growing season. Crop
growth before canopy closure could be described by an
exponential equation of y = α･exp(β･t) where α is the
crop leaf area index (LAI) or shoot dry weight (DW), t is
the thermal time, β is the LAI or DW at the beginning of
the exponential growth and is the relative growth rate of
LAI (m²m-²℃-¹) or DW(gg-²℃-¹). Field experiment using 22
cultivars revealed that the exponential growth phase before
canopy closure can be divided into two sections; an earlier
section during which crop dry weight and LAI of varieties
are highly dependent on α and a second section where crop
dry weight and LAI are highly dependent on β. Grain weight
had significantly positive correlation with α parameter and
dry weight and LAI during early exponential phase. The
parameter β of the exponential growth curve had positive
and significant correlation with the LAI and dry weight
during the late exponential growth phase, grain number per
unit area, and grain yield. There was genotypic difference
for RCC parameters, α and β, indicating the possibility of
genetic improvement for these traits.

영어초록

Rapid canopy closure (RCC) is one of the
physiological attributes that may enhance genetic yield potential
of rice (Oryza sativa L.) in a growing season. Crop
growth before canopy closure could be described by an
exponential equation of y = α･exp(β･t) where α is the
crop leaf area index (LAI) or shoot dry weight (DW), t is
the thermal time, β is the LAI or DW at the beginning of
the exponential growth and is the relative growth rate of
LAI (m²m-²℃-¹) or DW(gg-²℃-¹). Field experiment using 22
cultivars revealed that the exponential growth phase before
canopy closure can be divided into two sections; an earlier
section during which crop dry weight and LAI of varieties
are highly dependent on α and a second section where crop
dry weight and LAI are highly dependent on β. Grain weight
had significantly positive correlation with α parameter and
dry weight and LAI during early exponential phase. The
parameter β of the exponential growth curve had positive
and significant correlation with the LAI and dry weight
during the late exponential growth phase, grain number per
unit area, and grain yield. There was genotypic difference
for RCC parameters, α and β, indicating the possibility of
genetic improvement for these traits.

참고자료

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