Screening of Resistant Lines and Yield Losses to F1 Corn from Feeding by the Aphid and Mite

진딧물과 응애 가해에 의한 옥수수 F1의 수량감소율 과 저항성계통 선발

  • Received : 2010.12.04
  • Published : 2010.12.31

Abstract

Aphid and mite are the major insects that harm corn. These insects are difficult to control because they are very sensitive to environmental conditions. The purpose of this experiment was to information the loss in quantity of corn and to select inbred lines with resistance after exposing corn to aphid and mite. When exposed to aphid, the average loss in grain yield, ear length, ear diameter, 100 kernel weight, kernel length, kernel width, and kernel thickness were 18.4, 10.9, 1.7, 5.4, 2.3, 1.5 and -0.2%, respectively. When exposed to mite, the average loss in grain yield, ear length, ear diameter, 100 kernel weight, kernel length, kernel width, and kernel thickness were 49.7, 16.5, 20.7, 18.9, 9.5, and -3.4, respectively. Mite had more significant impact on the loss than aphid. Among these factors, grain yield and ear dimater were most significantly correlated on the loss to aphid ($r=0.83^{**}$), while kernel length and thickness were most significantly correlated on the loss to mite ($r=0.83^{**}$). However, ear length was not related to loss to the two insects. The inbred lines that were often used for $F_1$ hybrid which was lower than the average loss by aphid, were KS7, B68, 61B3, 70A1, and KS5, while the inbred lines that were often used for $F_1$ hybrid which was lower than the average decrease by mite, were KS7, B68, 61B3, 66B2-4, 70A1, 72B2, and KS5. These inbred lines could be used to breed inbred lines, hybrid, and open pollination variety that confer resistant to aphid and mite.

본 연구는 14개 육성 $F_1$을 이용하여 진딧물과 응애 가해에 의한 옥수수의 수량감소율과 저항성 자식계통을 선발하고자 본 시험을 수행하였다. 진딧물 가해에 의한 수량감소율은 종실중(18.4%), 이삭장(10.9%), 이삭직경(1.7%), 100립중(5.4%), 종실 길이(2.3%), 종실 폭(1.5%), 종실 두께(-0.2%)이었다. 조사항목에 대한 수량감소의 상관관계를 분석한 결과 진딧물은 종실중과 이삭직경이 높은 고도의 유의한 정(+)의 상관($r=0.83^{**}$), 그 다음으로 100립중과 종실 길이($r=0.74^{**}$), 종실폭($r=0.69^{**}$)이었다. 반면 이삭장과 종실 두께는 상관관계가 전혀 없는 것으로 확인되었다. 응애 가해에 의한 수량감소율은 종실중(49.7%), 이삭장(16.5%), 이삭직경(7.5%), 100립중(20.7%), 종실 길이(18.9%), 종실 폭(9.5%), 종실 두께(-3.4%)이었다. 진딧물 보다 응애 가해 시 감소율은 종실중 2.7배, 이삭장 1.5배, 이삭폭 3.9배, 100립중 3.9배, 종실 길이 10.5배, 종실 폭이 8배 더 컸다. 반면 종실 두께의 감소율은 응애 보다 진딧물 가해시 -0.7배 더 컸다. 응애의 상관관계에서 종실 길이와 종실 폭이 높은 고도의 유의한 정(+)의 상관관계($r=0.83^{**}$)가 인정되었다. 그 다음으로 100립중과 종실 길이($r=0.74^{**}$), 종실 길이와 종실중($r=0.69^{**}$)이었다. 반면 종실 두께는 어떠한 조사항목과도 상관관계가 없었다. 7가지 조사항목 별 진딧물 가해에 의한 평균감소율 보다 낮은 $F_1$에 많이 이용된 자식계통은 KS7, B68, 61B3, 70A1, KS5이었고, 응애 가해에 의한 평균감소율 보다 낮은 $F_1$에 많이 이용된 자식계통은 KS7, B68, 61B3, 66B2-4, 70A1, 72B2, KS5이었다. 이들 자식계통은 추 후 진딧물 과 응애 저항성 자식계통 육성에 이용될 수 있을 것이다.

Keywords

Acknowledgement

Grant : 북한 적응형 슈퍼옥수수 남북공동연구 개발

Supported by : 과학기술부

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