Light‐limited photosynthesis under energy‐saving film decreases eggplant yield

Food and Energy Security

Michael E. Loik¹  Joao C. Filipe²  Baohua Jia³  Han Lin³  David T. Tissue⁴  Yagiz Alagoz⁴  Christopher I. Cazzonelli⁴  Sachin G. Chavan⁴  Chelsea Maier⁴  Zhonghua H. Chen⁴  Oula Ghannoum⁴  Charles R. Warren⁵ 

[1] Department of Environmental Studies University of California Santa Cruz CA USA;Environmental and Conservation Sciences Murdoch University Murdoch WA Australia;Faculty of Science, Engineering and Technology Centre for Translational Atomaterials Swinburne University of Technology Hawthorn Vic. Australia;National Vegetable Protected Cropping Centre Hawkesbury Institute for the EnvironmentWestern Sydney University Penrith NSW Australia;University of Sydney Camperdown NSW Australia;

关键词: eggplant;    energy;    light;    photosynthesis;    protected cropping;    smart glass;   

DOI  :  10.1002/fes3.245

来源: DOAJ

【 摘 要 】

Abstract Glasshouse films with adjustable light transmittance and energy‐efficient designs have the potential to reduce (up to 80%) the high energy cost for greenhouse horticulture operations. Whether these films compromise the quantity and quality of light transmission for photosynthesis and crop yield remains unclear. A “Smart Glass” film ULR‐80 (SG) was applied to a high‐tech greenhouse horticulture facility, and two experimental trials were conducted by growing eggplant (Solanum melongena) using commercial vertical cultivation and management practices. SG blocked 85% of ultraviolet (UV), 58% of far‐red, and 26% of red light, leading to an overall reduction of 19% in photosynthetically active radiation (PAR, 380–699 nm) and a 25% reduction in total season fruit yield. There was a 53% (season mean) reduction in net short‐wave radiation (radiometer range, 385–2,105 nm upward; 295–2,685 nm downward) that generated a net reduction of 8% in heat load and reduced water and nutrient consumption by 18%, leading to improved energy and resource use efficiency. Eggplant adjusted to the altered SG light environment via decreased maximum light‐saturated photosynthetic rates (Amax) and lower xanthophyll de‐epoxidation state. The shift in light characteristics under SG led to reduced photosynthesis, which may have reduced source (leaf) to sink (fruit) carbon distribution, increased fruit abortion and decreased fruit yield, but did not affect nutritional quality. We conclude that SG increases energy and resource use efficiency, without affecting fruit quality, but the reduction in photosynthesis and eggplant yield is high. The solution is to re‐engineer the SG to increase penetration of UV and PAR, while maintaining blockage of glasshouse heat gain.

【 授权许可】

Unknown