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Bringing cam photosynthesis to the table:Paving the way for resilient and productive agricultural systems in a changing climate

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Plant Communications 2024年第3期5卷 17-30页

作者： Noe´Perron Matias Kirst Sixue Chen Plant Molecular and Cellular Biology Program University of FloridaGainesvilleFL 32608USA School of Forest Fisheries and Geomatics SciencesUniversity of FloridaGainesvilleFL 32603USA Department of Biology University of MississippiOxfordMS 38677-1848USA

Modern agricultural systems are directly threatened by global climate change and the resulting freshwater crisis.A considerable challenge in the coming years will be to develop crops that can cope with the conse-quences of declining freshwater resources and changing *** approach to meeting this chal-lenge may lie in our understanding of plant photosynthetic adaptations and water use *** from various taxa have evolved crassulacean acid metabolism(cam),a water-conserving adaptation of photosynthetic carbon dioxidexation that enables plants to thrive under semi-arid or seasonally drought-prone *** past research on cam has led to a better understanding of the inner workings of plant resilience and adaptation to stress,successful introduction of this pathway into C3 or C4 plants has not been *** recent revolution in molecular,systems,and synthetic biology,as well as innovations in high-throughput data generation and mining,creates new opportunities to uncover the minimum genetic tool kit required to introduce cam traits into drought-sensitive ***,we pro-pose four complementary research avenues to uncover this tool ***,genomes and computational methods should be used to improve understanding of the nature of variations that drive cam ***,single-cell’omics technologies offer the possibility for in-depth characterization of the mecha-nisms that trigger environmentally controlled cam ***,the rapid increase in new’omics data enables a comprehensive,multimodal exploration of ***,the expansion of functional geno-mics methods is paving the way for integration of cam into farming systems.

关键词： cam photosynthesis single-cell genomics phylogenetics crop engineering synthetic biology stress resilience

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High-quality Cymbidium mannii genome and multifaceted regulation of crassulacean acid metabolism in epiphytes

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Plant Communications 2023年第5期4卷 191-207页

作者： Weishu Fan Zheng-Shan He Mengqing Zhe Jing-Qiu Feng Le Zhang Yiwei Huang Fang Liu Jia-Lin Huang Ji-Dong Ya Shi-Bao Zhang Jun-Bo Yang Andan Zhu De-Zhu Li Germplasm Bank of Wild Species Kunming Institute of BotanyChinese Academy of SciencesKunmingYunnan 650201China Kunming College of Life Science University of Chinese Academy of SciencesKunmingYunnan 650201China Key Laboratory for Economic Plants and Biotechnology Kunming Institute of BotanyChinese Academy of SciencesKunmingYunnan 650201China Yuxi Normal University YuxiYunnan 653100China

Epiphytes with crassulacean acid metabolism(cam)photosynthesis are widespread among vascular plants,and repeated evolution of cam photosynthesis is a key innovation for micro-ecosystem ***,we lack a complete understanding of the molecular regulation of cam photosynthesis in ***,we report a high-quality chromosome-level genome assembly of a cam epiphyte,Cymbidium mannii(Orchidaceae).The 2.88-Gb orchid genome with a contig N50 of 22.7 Mb and 27192 annotated genes was organized into 20 pseudochromosomes,82.8%of which consisted of repetitive *** expansions of long terminal repeat retrotransposon families have made a major contribution to the evolution of genome size in Cymbidium *** reveal a holistic scenario of molecular regulation of metabolic physiology using high-resolution transcriptomics,proteomics,and metabolomics data collected across a cam diel *** of rhythmically oscillating metabolites,especially cam-related products,reveal circadian rhythmicity in metabolite accumulation in *** analysis of transcript and protein level regulation revealed phase shifts during the multifaceted regulation of circadian ***,we observed diurnal expression of several core cam genes(especially bCA and PPC)that may be involved in temporal fixation of carbon *** study provides a valuable resource for investigating post-transcription and translation scenarios in ***,an Orchidaceae model for understanding the evolution of innovative traits in epiphytes.

关键词： epiphytes cam photosynthesis multi-omics phase shifts rhythmic metabolites

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photosynthesis of Submerged and Surface Leaves of the Dwarf Water Lily(Nymphoides aquatica)Using PAM Fluorometry

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Journal of Botanical Research 2022年第3期4卷 25-43页

作者： Tharawit Wuthirak Raymond J.Ritchie Department of Biology Faculty of SciencePrince of Songkla UniversityHat Yai90112Thailand Tropical Plant Biology Unit Faculty of Technology and EnvironmentPrince of Songkla UniversityPhuket83120Thailand

Dwarf Water Lilies Nymphoides aquatica(***)Kuntze have floating and submerged *** submerged aquatic vascular plants have a form of cam(Crassulacean Acid Metabolism)called Submerged Aquatic Macrophyte(SAM)***-diode based PAM technology was used to measure the Photosynthetic Oxygen Evolution Rate(POER:1O_(2)≡4e^(-)).Optimum Irradiance(E_(opt)),maximum POER(POER_(max))and quantum efficiency(α_(0))all vary on a diurnal *** shape of the POER vs.E curves is different in seedling,submerged and surface *** E_(opt) and POER_(max) are very low in seedling leaves(E_(opt)≈104μmol photon m^(-2) s^(-1),PPFD;POER_(max)≈4.95µmol O_(2) g^(-1) Chl a s^(-1)),intermediate in mature submerged leaves(E_(opt)≈419µmol photon m^(-2) s^(-1) PPFD,POER_(max)≈38.1µmol O_(2) g^(-1) Chl a s^(-1))and very high in surface leaves(E_(opt)≈923µmol photon m^(-2) s^(-1) PPFD,POER_(max)≈76.1µmol O_(2) g^(-1) Chl a s^(-1)).Leaf titratable acid(C4 acid pool)is too small(≈20 to 50 mol H+m^(-3))to support substantial SAM *** daily photosynthesis of surface leaves is≈3.71 g C m^(-2) d^(-1) in full sun and as much as 1.4 gC m^(-2) d^(-1) in shaded submerged *** is midday inhibition of photosynthesis.

关键词： cam photosynthesis SAM photosynthesis Submerged aquatic macrophyte Carbon fixation Diurnal cycle Photosynthetic oxygen evolution rate(POER) Light curves PAM fluorometry Photosynthetic photon fluence rate(PPFD) Primary productivity

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