Effects of elevated CO<sub>2</sub> concentration on growth and photosynthesis of Chinese yam under different temperature regimes

Thinh, Nguyen Cong; Shimono, Hiroyuki; Kumagai, Etsushi; Kawasaki, Michio

doi:10.1080/1343943x.2017.1283963

Cited by 14 publications

(17 citation statements)

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“…Tipping and Murray (1999), in researching Panicum trichanthum, P. antidotale, and P. decipiens, attributed increased starch accumulation at elevated [CO 2 ] to enhanced photosynthesis. In this study, our results suggested that the increased starch grain accumulation in the chloroplast under elevated [CO 2 ] may be caused by an increase in the leaf photosynthetic rate under elevated [CO 2 ] (Thinh et al, 2017a) and act as a mechanism for storing carbon.…”

Section: Discussionmentioning

confidence: 64%

“…However, it is widely assumed that photorespiration is suppressed at high [CO 2 ]. In our previous study (Thinh et al, 2017a), we found that the net photosynthetic rate was 36-73% higher in Chinese yams grown under elevated [CO 2 ] than under ambient [CO 2 ]. These results suggest that an increase in the number of chloroplasts in Chinese yam leaves is one of the factors underlying the increase in photosynthesis under elevated [CO 2 ].…”

Section: Discussionmentioning

confidence: 97%

“…In our previous studies, we showed that all growth parameters related to size (number of leaves, vine length, and leaf blade area) and weight (dry weight of leaves, vines, roots, tubers, and whole plants), and the net photosynthetic rate in Chinese yam were greater under elevated [CO 2 ] than under ambient [CO 2 ] (Thinh et al, 2017a(Thinh et al, , 2017b. In this study, we found that the thickness of the leaf blade and palisade tissue layer, the number of chloroplasts, and the stomatal density, and pore length in Chinese yam were greater under elevated [CO 2 ] than under ambient [CO 2 ].…”

Section: Discussionmentioning

confidence: 99%

“…In the case of Chinese yam, our previous studies on the effects of elevated [CO 2 ] on growth and photosynthesis showed that Chinese yam responds positively to elevated [CO 2 ] both at the early growth stage (Thinh et al, 2017b) and at the intermediary vegetative stage (Thinh et al, 2017a). Yam leaf number, leaf area, leaf dry weight (DW), and total plant DW were higher under elevated [CO 2 ] than under ambient [CO 2 ] (Thinh et al, 2017b).…”

Section: Introductionmentioning

confidence: 99%

“…Yam leaf number, leaf area, leaf dry weight (DW), and total plant DW were higher under elevated [CO 2 ] than under ambient [CO 2 ] (Thinh et al, 2017b). The photosynthetic rate was also enhanced by elevated [CO 2 ] (Thinh et al, 2017a). However, no possible mechanism was proposed to explain how yams positively respond to elevated [CO 2 ] and whether the yam response is related to leaf structure changes under elevated [CO 2 ].…”

Section: Introductionmentioning

confidence: 99%

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Effects of elevated atmospheric CO₂ concentration on morphology of leaf blades in Chinese yam

Thinh

Kumagai

Shimono

et al. 2018

Plant Production Science

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The effects of elevated carbon dioxide concentration on the morphology of leaf blades in two Chinese yam lines under different temperature conditions were determined. Plants were grown under two [CO 2 ] levels, ambient (about 400 µmol mol −1 ) and elevated (ambient + 200 µmol mol −1 ) in the daytime, and two mean air temperature regimes, approximately ambient temperature (22.2°C) and high temperature (25.6°C). The palisade layer was thicker under elevated [CO 2 ] than under ambient [CO 2 ] in both temperature regimes, and the whole yam leaf blade was thicker under elevated [CO 2 ] than under ambient [CO 2 ] in the approximately ambient temperature regime. The numbers of chloroplasts per palisade cell and spongy cell as well as per unit profile area of palisade cell, number of starch grains per chloroplast, profile area of the starch grain, and starch-to-chloroplast area ratio in both palisade and spongy cells were higher under elevated [CO 2 ] than under ambient [CO 2 ] in both temperature regimes. Furthermore, the stomatal density on the abaxial side of the leaf blade in Chinese yam was greater under elevated [CO 2 ] than under ambient [CO 2 ] under both temperature regimes, and stomatal-pore length was higher under elevated [CO 2 ] than under ambient [CO 2 ] in the approximately ambient temperature regime. These results indicate that elevated [CO 2 ] positively affects the photosynthetic apparatus. The results of this study provide information for understanding the response characteristics of the leaf blade under elevated [CO 2 ] and a possible explanation for the positive photosynthetic responses of Chinese yam to elevated [CO 2 ] in our previous study. List of Abbreviations:[CO 2 ]: carbon dioxide concentration ARTICLE HISTORY

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Section: Discussionmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of elevated atmospheric CO₂ concentration on morphology of leaf blades in Chinese yam

Thinh

Kumagai

Shimono

et al. 2018

Plant Production Science

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An underutilized orphan tuber crop—Chinese yam : a review

Epping¹,

Laibach

2020

Planta

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Main conclusion The diversification of food crops can improve our diets and address the effects of climate change, and in this context the orphan crop Chinese yam shows significant potential as a functional food. Abstract As the effects of climate change become increasingly visible even in temperate regions, there is an urgent need to diversify our crops in order to address hunger and malnutrition. This has led to the re-evaluation of neglected species such as Chinese yam (Dioscorea polystachya Turcz.), which has been cultivated for centuries in East Asia as a food crop and as a widely-used ingredient in traditional Chinese medicine. The tubers are rich in nutrients, but also contain bioactive metabolites such as resistant starches, steroidal sapogenins (like diosgenin), the storage protein dioscorin, and mucilage polysaccharides. These health-promoting products can help to prevent cardiovascular disease, diabetes, and disorders of the gut microbiome. Whereas most edible yams are tropical species, Chinese yam could be cultivated widely in Europe and other temperate regions to take advantage of its nutritional and bioactive properties. However, this is a laborious process and agronomic knowledge is fragmented. The underground tubers contain most of the starch, but are vulnerable to breaking and thus difficult to harvest. Breeding to improve tuber shape is complex given the dioecious nature of the species, the mostly vegetative reproduction via bulbils, and the presence of more than 100 chromosomes. Protocols have yet to be established for in vitro cultivation and genetic transformation, which limits the scope of research. This article summarizes the sparse research landscape and evaluates the nutritional and medical applications of Chinese yam. By highlighting the potential of Chinese yam tubers, we aim to encourage the adoption of this orphan crop as a novel functional food.

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The increasing carbon dioxide (CO2) due to global climate change strengthens the plants and inhibits pathogenic infection

Bashir

Atiq

Mohsan

2018

Environ Sci Pollut Res

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Effects of elevated CO₂ concentration on growth and photosynthesis of Chinese yam under different temperature regimes

Abstract: Chinese yam ('yam')

Cited by 14 publications

References 38 publications

Effects of elevated atmospheric CO₂ concentration on morphology of leaf blades in Chinese yam

Effects of elevated atmospheric CO₂ concentration on morphology of leaf blades in Chinese yam

An underutilized orphan tuber crop—Chinese yam : a review

The increasing carbon dioxide (CO2) due to global climate change strengthens the plants and inhibits pathogenic infection

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Effects of elevated CO2 concentration on growth and photosynthesis of Chinese yam under different temperature regimes

Abstract: Chinese yam ('yam')

Cited by 14 publications

References 38 publications

Effects of elevated atmospheric CO2 concentration on morphology of leaf blades in Chinese yam

Effects of elevated atmospheric CO2 concentration on morphology of leaf blades in Chinese yam

An underutilized orphan tuber crop—Chinese yam : a review

The increasing carbon dioxide (CO2) due to global climate change strengthens the plants and inhibits pathogenic infection

Contact Info

Product

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Effects of elevated CO₂ concentration on growth and photosynthesis of Chinese yam under different temperature regimes

Effects of elevated atmospheric CO₂ concentration on morphology of leaf blades in Chinese yam

Effects of elevated atmospheric CO₂ concentration on morphology of leaf blades in Chinese yam