KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Effects of Water-deficit Stress on Yield and Chlorophyll Fluorescence in Rice during the Early Tillering Stage

분얼기 수분 스트레스가 벼 생육 특성 및 엽록소 형광 반응에 미치는 영향

  • Han, Chae-Min (Division of Crops Research, Gyeongsangbuk-do Provincial Agricultural Research & Extension Services) ;
  • Shin, Jong-Hee (Division of Crops Research, Gyeongsangbuk-do Provincial Agricultural Research & Extension Services) ;
  • Kwon, Jung-Bae (Division of Crops Research, Gyeongsangbuk-do Provincial Agricultural Research & Extension Services) ;
  • Won, Jong-Gun (Division of Crops Research, Gyeongsangbuk-do Provincial Agricultural Research & Extension Services) ;
  • Kim, Sang-Kuk (Gumi Floriculture Research Institute)
  • 한채민 (경북농업기술원 작물연구과) ;
  • 신종희 (경북농업기술원 작물연구과) ;
  • 권중배 (경북농업기술원 작물연구과) ;
  • 원종건 (경북농업기술원 작물연구과) ;
  • 김상국 (구미화훼연구소)
  • Received : 2022.02.24
  • Accepted : 2022.05.05
  • Published : 2022.06.01
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Abstract

This study aimed to evaluate the growth, yield, and grain quality characteristics of rice varieties that were subjected to water stress during the tillering stage. We also sought to identify whether water stress could be indicated via the plants' response to chlorophyll fluorescence. In this study, we induced water stress by intentionally cutting off water for 30 days, starting 15 days after transplanting the rice varieties to a greenhouse. We analyzed nine rice varieties, including Ilpum, which is the most frequently cultivated variety in Gyeongsangbuk-do, South Korea. The control group was planted in a paddy field where irrigation was entirely dependent on rainfall. Our results revealed that the heading stage of the nine studied varieties occurred approximately ten days earlier in the rain shelter than in the field. Moreover, the rice yield, head rice rate, and palatability score decreased by 18.6%, 17.1%, and 8.3%, respectively, while protein content increased by 20.2% compared with the control group. The Saenuri and Haimi varieties showed the lowest reduction in yield under the water stress conditions, while the Daebo and Samkwang varieties showed the highest reduction in yield. The chlorophyll fluorescence response after re-irrigation was measured between July 30th and August 17th. The ratio of variable fluorescence to maximum chlorophyll fluorescence (FV/FM) values failed to recover to their baseline values, resulting in either no change or a reduction in fluorescent response, even after re-irrigation of Daebo and Samkwang varieties. These results can be utilized as empirical data for drought-affected farms to select resistant varieties that can respond to spring drought in the southern plains of Gyeongsangbuk-do.

일품등 9품종을 대상으로 경북 남부 평야지역 봄 가뭄 대응 벼 품종별 재배안정성을 평가하기 위해 분얼초기 인위적으로 수분 부족 스트레스를 유도한 결과는 다음과 같다. 1. 일품등 9품종 대상으로 수분 부족 스트레스에 따른 결과는 평균적으로 관행대비 출수기는 약10일 빠르고 쌀수량은 약 18.6% 감소, 담백질 함량은 20.2% 증가, 식미치는 8.3% 감소하였다. 2. 본 연구에서 수량에 가장 영향을 미치는 인자는 2차 지경 분화기에 가장 영향을 받는 영화수와 천립중으로 나타났다. 3. 잎마름이 50%에 도달할때까지 소요일수가 가장 긴 품종은 새누리, 가장 짧은 품종은 대보였다. 4. 재관개 후에도 대보와 삼광은 수량감소가 가장 컸을뿐 아니라 FV/FM 관행 초기값으로 회복하지 못하여 가뭄의 광생리학적 지표의 가능성을 확인하였다. 따라서 경북 남부 평야지역에서는 봄 가뭄 대응 내건성 벼 품종은 새누리와 하이아미가 가장 적합하고 내건성이 약한 품종들은 재관개 후에도 광합성 효율이 낮아 수량감소로 이어져 이러한 결과에 따라 관행대비 쌀 수량감소율과 단백질 함량이 낮고 식미치가 높은 품종으로 새누리, 하이아미가 내건성 적합품종으로 선발되었다.

Keywords

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