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Photobiological Responses and Mechanistic Interpretations of Far-Red Light and Its Interactions With Photon Flux Density, Temperature, and Skotoperiod in Leafy-Green Vegetables
Photobiological Responses and Mechanistic Interpretations of Far-Red Light and Its Interactions With Photon Flux Density, Temperature, and Skotoperiod in Leafy-Green Vegetables
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104829
- ISBN
- 9798290929071
- DDC
- 635
- 저자명
- Shin, Jiyong.
- 서명/저자
- Photobiological Responses and Mechanistic Interpretations of Far-Red Light and Its Interactions With Photon Flux Density, Temperature, and Skotoperiod in Leafy-Green Vegetables
- 발행사항
- [Sl] : Michigan State University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 193 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
- 주기사항
- Advisor: Runkle, Erik.
- 학위논문주기
- Thesis (Ph.D.)--Michigan State University, 2025.
- 초록/해제
- 요약Light-grown plants perceive far-red (FR; 700-750 nm) light mostly through phytochrome B (PHYB), which is primarily a red- (R; 600-699 nm) and FR-absorbing photoreceptor. Under a plant canopy, the fraction of the FR photon flux density (PFD) to the sum of R and FR PFD (FR fraction) is typically high. In response to a high FR fraction, plants elongate stems and leaves (or petioles) to escape from shade, a process known as the shade-avoidance response. This response typically also involves an increase in specific leaf area (SLA; leaf area per unit leaf dry mass). Shade-avoidance responses without a concurrent decrease in irradiance can, to some extent, increase plant biomass by regulating canopy area and thus potential light interception. Although numerous studies have investigated the effects of FR light on plant growth, experimental approaches, results, and interpretations have been inconsistent. This is likely because other environmental parameters influence the FR-light signaling pathway including temperature, the PFDs of R+FR and blue (B; 400-499 nm) light, and skotoperiod. Accounting for these variables could help clarify distinct effects of FR light.This dissertation research investigated the interaction between the FR fraction and air temperature, the R+FR PFD, the B-PFD, and skotoperiod in regulating the morphology and growth of leafy-green vegetables. We conducted experiments under sole-source lighting (without sunlight) in walk-in rooms where environmental parameters were rigidly controlled and continuously monitored. In the first experiment, a decrease in the air temperature from 24 to 19°C suppressed FR-mediated shoot extension in cold-tolerant lettuce (Lactuca sativa) but not in cold-sensitive basil (Ocimum basilicum). In the second experiment, contrary to the paradigm that high-light intensity attenuates the effects of FR light, FR-mediated increases in leaf elongation and specific leaf area persisted under high light provided exclusively by R+FR light in lettuce and kale (Brassica oleracea var. sabellica). These morphological responses aligned with PHYB activity estimated using a three-state PHYB model in Arabidopsis, which accounts for the effects of the FR fraction as well as the R+FR PFD. In the third experiment, an increase in the B-PFD suppressed FR-mediated stem elongation and SLA increase in kale and lettuce. However, FR-mediated increases in shoot biomass accumulation and total leaf area surprisingly increased with the B-PFD, suggesting that at least a moderate B-PFD is required for FR-mediated enhancements in biomass and leaf expansion. Lastly, a long skotoperiod (16 h∙d−1) diminished FR-light effects on hypocotyl, stem, and leaf elongation compared to shorter skotoperiods (0 or 8 h∙d−1) in kale but not in lettuce. Collectively, these findings provide mechanistic insight into how FR-light signaling is modulated by air temperature, the R+FR PFD, the B-PFD, and skotoperiod, which vary in nature and controlled-environment agriculture. Results can also be applied to electric lighting applications in horticulture to maximize plant response.
- 일반주제명
- Horticulture
- 일반주제명
- Plant sciences
- 일반주제명
- Agriculture
- 일반주제명
- Agronomy
- 키워드
- Phytochrome B
- 키워드
- Skotoperiod
- 기타저자
- Michigan State University Horticulture - Doctor of Philosophy
- 기본자료저록
- Dissertations Abstracts International. 87-02B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202104829
■006m o d
■007cr#unu||||||||
■020 ▼a9798290929071
■035 ▼a(MiAaPQ)AAI32170266
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a635
■1001 ▼aShin, Jiyong.
■24510▼aPhotobiological Responses and Mechanistic Interpretations of Far-Red Light and Its Interactions With Photon Flux Density, Temperature, and Skotoperiod in Leafy-Green Vegetables
■260 ▼a[Sl]▼bMichigan State University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a193 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-02, Section: B.
■500 ▼aAdvisor: Runkle, Erik.
■5021 ▼aThesis (Ph.D.)--Michigan State University, 2025.
■520 ▼aLight-grown plants perceive far-red (FR; 700-750 nm) light mostly through phytochrome B (PHYB), which is primarily a red- (R; 600-699 nm) and FR-absorbing photoreceptor. Under a plant canopy, the fraction of the FR photon flux density (PFD) to the sum of R and FR PFD (FR fraction) is typically high. In response to a high FR fraction, plants elongate stems and leaves (or petioles) to escape from shade, a process known as the shade-avoidance response. This response typically also involves an increase in specific leaf area (SLA; leaf area per unit leaf dry mass). Shade-avoidance responses without a concurrent decrease in irradiance can, to some extent, increase plant biomass by regulating canopy area and thus potential light interception. Although numerous studies have investigated the effects of FR light on plant growth, experimental approaches, results, and interpretations have been inconsistent. This is likely because other environmental parameters influence the FR-light signaling pathway including temperature, the PFDs of R+FR and blue (B; 400-499 nm) light, and skotoperiod. Accounting for these variables could help clarify distinct effects of FR light.This dissertation research investigated the interaction between the FR fraction and air temperature, the R+FR PFD, the B-PFD, and skotoperiod in regulating the morphology and growth of leafy-green vegetables. We conducted experiments under sole-source lighting (without sunlight) in walk-in rooms where environmental parameters were rigidly controlled and continuously monitored. In the first experiment, a decrease in the air temperature from 24 to 19°C suppressed FR-mediated shoot extension in cold-tolerant lettuce (Lactuca sativa) but not in cold-sensitive basil (Ocimum basilicum). In the second experiment, contrary to the paradigm that high-light intensity attenuates the effects of FR light, FR-mediated increases in leaf elongation and specific leaf area persisted under high light provided exclusively by R+FR light in lettuce and kale (Brassica oleracea var. sabellica). These morphological responses aligned with PHYB activity estimated using a three-state PHYB model in Arabidopsis, which accounts for the effects of the FR fraction as well as the R+FR PFD. In the third experiment, an increase in the B-PFD suppressed FR-mediated stem elongation and SLA increase in kale and lettuce. However, FR-mediated increases in shoot biomass accumulation and total leaf area surprisingly increased with the B-PFD, suggesting that at least a moderate B-PFD is required for FR-mediated enhancements in biomass and leaf expansion. Lastly, a long skotoperiod (16 h∙d−1) diminished FR-light effects on hypocotyl, stem, and leaf elongation compared to shorter skotoperiods (0 or 8 h∙d−1) in kale but not in lettuce. Collectively, these findings provide mechanistic insight into how FR-light signaling is modulated by air temperature, the R+FR PFD, the B-PFD, and skotoperiod, which vary in nature and controlled-environment agriculture. Results can also be applied to electric lighting applications in horticulture to maximize plant response.
■590 ▼aSchool code: 0128.
■650 4▼aHorticulture
■650 4▼aPlant sciences
■650 4▼aAgriculture
■650 4▼aAgronomy
■653 ▼aLight-grown plants
■653 ▼aPhoton flux density
■653 ▼aPhytochrome B
■653 ▼aSkotoperiod
■653 ▼aLeafy-green vegetables
■690 ▼a0471
■690 ▼a0479
■690 ▼a0473
■690 ▼a0285
■71020▼aMichigan State University▼bHorticulture - Doctor of Philosophy.
■7730 ▼tDissertations Abstracts International▼g87-02B.
■790 ▼a0128
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359063▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
