• 제목/요약/키워드: Leaf Senescence

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국내 육성 및 수입 옥수수 품종의 사일리지 생산성 (Silage Productivity of Korean Improved and Introduced Maize Hybrids)

  • 이석순;윤상희;서정문;양승규;민황기;유시환;박종렬;김순권
    • 한국초지조사료학회지
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    • 제24권4호
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    • pp.323-334
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    • 2004

  • 사일리지 옥수수를 제배하는 양축 농가와 육종가에게 필요한 정보를 제공하기 위하여 국내육성품종과 미국 수입품종의 사일리지 생산성과 여러 가지 재배특성을 경산에서 5년간, 홍천에서 1년간 비교하였다. 1.출아 후 20일의 초장과 사일리지 건물중은 품종 간 차이는 있었지만 초기생육은 사일리지 수량과는 상관이 없었다. 2. 경산지방에서 수원19호의 건물수량은 높은 편이었으나 흑조위축병 저항성과 후기 녹체성이 가장 낮았다. 광안옥의 수량성은 다른 품종의 중간 정도이었고, 흑조위측병 저항성은 큰 편이었으며, 후기 녹체성은 낮았다. 대체로 국내 육성품종의 흑조위축병 저항성과 후기 녹체성은 수입 품종보다 낮았다. 수원19호의 사일리지 수량성은 우수한 수입 품종과 비슷하였으며, 일부 수입 품종은 국내 육성품종보다 수량성이 낮았다. 3. 홍천에서는 국내 육성 품종이 DK729, NC+5514 보다는 사일리지 수량이 낮았지만 다른 수입 품종보다는 수량이 더 높거나 비슷하였고, 수확기에 일의 노화가 빨랐다. 4. 사일리지 옥수수 품종을 육성할 때 수입 품종과 경쟁하기 위하여서는 건물수량은 물론 TDN 수량, 흑조위축병 저항성과 같은 내병성 및 후기 녹체성과 같은 농업적 특성이 고려되어야 할 것으로 생각된다.

  • https://doi.org/10.5333/KGFS.2004.24.4.323 인용 PDF KSCI

소맥겹의 Glutamine Synthetase 활성도에 관한 연구 I. 엽위별 GS활성도의 차이 및 출수후 "V"자형 변화현상 (Studies on the Activity of Glutamine Synthetase(GSA) in Wheat Leaves I. Variation of GSA by Different Leaf Position and its Depression Phenomenon after Inflorescence Emerged)

  • 손상목
    • 한국작물학회지
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    • 제34권1호
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    • pp.98-105
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    • 1989

  • 소맥생육기간중의 GS활성도의 경시적 변이진상을 알고저 소맥품종 Kolibri의 시비수준별, 엽위별 활성도를 분석한 결과, 1. 각엽에 있어서 생체종 1g당 GS활성도는 엽분화 초기에 극히 낮으나 엽의 전개, 신장에 따라 수배까지 증가하며 엽의 노화 진전과 더불어 하락하였다. 2. 생체종 1g당 GS활성도는 엽의 분화초기를 제외하면 아래로부터 상위엽 차순으로 높았으며, 최고의 활성도는 지엽에서 나타났다. 3. 최상위 2개엽은 최하위엽(제 1-4엽)보다 활성도와 활성 peak가 전 처리구에서 모두 2-3배 높았다. 4. 생체종 1g당 GS활성도는 제 1-4엽에서 1회의 활성 peak를 보인 반면 제6-지엽에서는 2회의 peak를 나타냈다. 5. GS활성도는 출tnrlRK지 증가하여 첫 번째 활성 peak에 이르고 그 이후 개화후 7일의 유숙기까지 급락하였다가 다시 증가하여 개화후 22일인 호숙기에 두 번찌 peak에 이르는 V자형 함몰현상을 나타냈다.

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The Role of $Ca^{2+}$ in Retardation Effects of Benzyladenine on the Senescence of Wheat (Triticum aestivum L.) Leaves

  • Hong, Kee-Jong;Jin, Chang-Duck;Hong, Young-Nam
    • Journal of Plant Biology
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    • 제39권2호
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    • pp.113-121
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    • 1996

  • The role of Ca2+ on benzyladenine (BA)-induced senescence retardation in mature wheat (Triticum aestivum L.) primary leaves was investigated. When an extracellular calcium chelator, ethylene glycol-bis-($\beta$-aminoethylether)-N, N'-tetraacetic acid (EGTA) together with BA, was applied to senescing leaves for 4 days of dark incubation, the content of chlorophyll and soluble protein decreased rapidly. And, the content of malondialdehyde (MDA), known to be a degradation product of membrane lipids, increased compared with the BA alone control. The BA-EGTA combination also caused the stimulation of protease and RNase activity and a rapid loss of catalase activity owing to the decling of BA effects. In the case of treatment with only intracellular calcium antagonist 3, 4, 5-trimethoxybenzoic acid 8-(diethylamino) octyl ester (TMB-8) without the BA addition, the chlorophyll content at day 4 after dark incubation decreased in paralled with the increasing concentration of the antagonist. In addition, the chlorophyll content at 10-5 M calcium ionophore A23187 treatment in the absence of BA was similar to that of the BA alone treatment. These results suggest that calcium may mediate the retardation effect of BA on leaf senescence by acting as a second messenger and that the calcium input from cell organelles, as well as the calcium inflow from intercellular spaces and cell walls, may be involved in modulating cytosolic calcium levels related to BA action.

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담배잎의 일생에 있어서 RuBisCO 함량과 Protease활성의 변동 (Changes of RuBisCO Content and Protease Activity during the Life Span of Tobacco Leaf)

  • 이학수
    • 한국연초학회지
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    • 제15권1호
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    • pp.63-74
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    • 1993

  • Changes in the amount of ribulose 1, 5-bisphosphate carboxylase/oygenase(=RuBisCO) protein, namely fraction I protein, and the protease activity were determined in the 10th leaf of tobacco(Nicotiana tabacum, var. Ky-57) from 10 days after emergence through senescence at 5 days interval. The amount of RuBisCO per deveined leaf rapidly increased during the early growing season, reached a maximal quantity at the around 20 days after leaf emergence, when the leaf has gone through its most rapid expansion, and began gradually to decrease till 30 days after leaf emergence, thereafter significantly declined to 45 days that the leaf has been dried up partly. The pattern of the ratio of RuBisCO protein to soluble protein in quantity changed similar to that of RuBisCO contents in a leaf, that was 43%, 60%, and 21% at the around 10 days, 20 days, and 45 days, respectively. And RuBisCO contents was linearly correlated with the concentration of chlorophyll(r=0.98) throughout the life span of the leaf. So, it was assumed that the leaf color can be a useful indicator for judging whether RuBisCO contents higher or not in tobacco leaves without homogenization. On the other hand, the protease activities for degradation of casein were assayed at pH 5.5. 7.0. and 8.5 with crude extracts desalted on Sephadex G-25. The highest caseolytic activity was found at pH 5.5 throughout the life sawn of the leaf. Also, the activity at 5.5 became gradually to increase from 30 days after leaf emergence, when RuBisCO protein had became to disappear and remarkably increased in the last stage of senescence, although nitrogen contents of the leaf had reached low levels. The caseolytic activity at pH 5.5 was in negative correlation with RuBisCO contents throughout the life span of the leaf, but not in lineality between them. In other words, the caseolytic activity increased in a rapid exponential manner when RuBisCO contents had reached some low levels. These results showed that the leaf age, namely harvesting time, is a very important factor for the production of the tobacco leaf containing higher RuBisCO protein. It was concluded that the practical harvesting time is between 20 days and 30 days after the leaf emergence from the present results.

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