Effect of Temperature on Photosynthesis Characteristics in the Passion Fruits ‘Summer Queen’ and ‘Ruby Star’

Abstract

The effects of temperature and light on photosynthetic, chlorophyll fluorescence characteristics under high temperature in the passion fruits 'Summer Queen' (P. edulis × P. edulis f. flavicarpa) and 'Ruby Star' (P. edulis × P. edulis f. flavicarpa) were examined. Photosynthetic rates of both cultivars markedly and linearly increased up to 300 μmol·m photosynthetic photon flux densities (PPFD). Regarding the relationship between temperature and photosynthesis, the maximum value of the apparent photosynthetic rate of 'Summer Queen' was observed at 30°C, and it was lower at both lower and higher temperatures. In 'Ruby Star', on the other hand, the maximum value was observed at 20 to 30°C, and this decreased at 35 and 40°C. The gross photosynthetic rate of 'Summer Queen' decreased over 30°C whereas in 'Ruby Star', it decreased to a lesser extent. The transpiration rate of 'Ruby Star' was higher than that of 'Summer Queen' at 40°C. Dark respiration increased from 20 to 40°C in both cultivars. Concerning chlorophyll fluorescence characteristics, 'Summer Queen' showed high-temperature injury at 40°C and all parameters were significantly decreased at 45°C. On the other hand, Fv/Fm showed only a slight decrease at 45°C in 'Ruby Star'. These results indicate that 'Summer Queen' is susceptible to heat stress and that the range of its optimal temperature for photosynthesis is lower than 'Ruby Star'.

Shade nets and substrates in seedling production of Annona squamosa L. in the Roraima Cerrado

“…Based on the present results, it should be highlighted that local temperature needs to be correctly managed for seedling production, since it may directly affect plant metabolism. Temperature interferes with the enzymatic activities (BELETI et al, 2012) and photosynthetic capacities (SHIMADA et al, 2017) of several plant species. The damage caused by high temperatures are reflected in chlorophyll fluorescence levels, since plants subjected to high temperatures present decreased photochemical quenching and increased non-photochemical quenching, decreasing the quantum efficiency of photosystem II (PSII) (XU et al, 2014).…”

“…The damage caused by high temperatures are reflected in chlorophyll fluorescence levels, since plants subjected to high temperatures present decreased photochemical quenching and increased non-photochemical quenching, decreasing the quantum efficiency of photosystem II (PSII) (XU et al, 2014). Losses in PSII efficiency lead to decreased function of the Cyt b 6 f complex, and consequently of photosystem I (PSI), resulting in the non-production of ATP and NADPH for the remaining photosynthetic processes (SHIMADA et al, 2017), which directly affects plant growth (TAIZ;ZAIGER, 2013).…”

Use of substrates and hydrogel to produce desert rose seedlings

“…Associated to that, the local meteorological conditions, already recorded at the experiment location (Monteiro Neto et al, 2018), favor more evapotranspiration chiefly due to high temperatures (Shimada et al, 2017), which must have increased water restriction to plants, which, according to Taiz and Zeiger (2013), affect all their development phases, limiting the growth of important physical characters like size, number of leaves, stem and branches, and may, therefore, make the plant more susceptible to attack by several phytophagous insects (Tiago Neto et al, 2017). With regard to the isolated effect of substrates, the compound containing OrganoAmazon ® and PuroHumus ® (S1) was the one that promoted most the development of desert rose seedlings, and was superior in all variables analyzed, including quality indices (Table 6).…”

Determination of maximum electron transport rate and its impact on allocation of electron flow

“…Chinese Journal of Plant Ecology, 42, 498-507. DOI: 10.17521/cjpe.2017.0320 植物的光合作用受光强、CO 2 浓度和温度等环 境因子的影响。Farquhar等(1980)以及其他学者 (von Caemmerer & Farquhar, 1981;Harley & Sharkey, 1991;von Caemmerer, 2000von Caemmerer, , 2013根据核酮糖-1,5-二磷酸羧化酶/加氧酶(Rubisco)酶动力学反应和核 酮糖-1,5-二磷酸(RuBP)再生反应化学计量学, 提出 C 3 植物光合生化模型(简称FvCB模型)。现在, FvCB 模型因能描述稳态的碳同化过程且具有明确的生物 学意义而被广泛应用于光合作用研究 (Dubois et al, 2007;Farquhar & Busch, 2017)。 生化模型由描述Rubisco酶活性限制、RuBP再 生限制和磷酸丙糖利用率(TPU)限制等3个过程的 子模型构成。其中非直角双曲线模型(简称模型I)是 生化模型的主要子模型 (Long & Bernacchi, 2003;Dubois et al, 2007;Farquhar & Busch, 2017; 梁星云 和刘世荣, 2017; 唐星林等, 2017a, 2017b)。在植物 光合作用对光响应曲线(A n -I曲线, I为光合有效辐射) 的拟合中, 模型I得到广泛的应用和验证, 但由此模 型拟合光响应曲线得到的最大净光合速率(A nmax )显 著高于实测值 (Calama et al, 2013;王荣荣等, 2013;冷寒冰等, 2014;Ježilová et al, 2015;Mayoral et al, 2015;Park et al, 2016;Bellucco et al, 2017;Quiroz et al, 2017), 这将高估植物的光合能力; 并且该模 型不能拟合植物发生光抑制时的光响应曲线 (Ye, 2007;dos Santos et al, 2013;王海珍等, 2017) (Cheng et al, 2001;Long & Bernacchi, 2003 (Serôdio et al, 2013;Li et al, 2015Li et al, , 2018Sun et al, 2015;Gao et al, 2017aGao et al, , 2017bShimada et al, 2017)…”

“…The values of J C-max and J O-max estimated by two models were compared using a paired-sample t test at  < 0.05 ( significance level); the values followed by the different superscript letters are significantly different between two models in each light environment. (Ye et al, 2013a(Ye et al, , 2013b, 可拟合不同环境 下植物的J-I曲线, 且获得的J max 和PAR sat 与实测值 高度符合 (Serôdio et al, 2013;叶子飘等, 2014;Li et al, , 2018Sun et al, 2015;Gao et al, 2017aGao et al, , 2017bShimada et al, 2017) 值 (Cheng et al, 2001;Long & Bernacchi, 2003;Dubois et al, 2007;Miao et al, 2009) (Farquhar et al, 1980;von Caemmerer & Farquhar, 1981;Harley & Sharkey, 1991;von Caemmerer, 2000;Dubois et al, 2007;Miao et al, 2009);…”