Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration

Aidar, S. T.; Meirelles, Sérgio Tadeu; Oliveira, Ricardo Ferraz de; Chaves, Agnaldo Rodrigues de Melo; Fernandes‐Júnior, Paulo Ivan

doi:10.1007/s11099-014-0014-0

Cited by 14 publications

(9 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The average obtained rates, around 4 μmol CO 2 m −2 s −1 (Fig. 4), are in the range found for other resurrection Gesneriaceae measured in potted plants under optimal conditions (Peeva & Cornic, 2009; Rakić et al , 2015; Rapparini et al , 2015) but are relatively low compared to tropical resurrection species (up to 12–14 μmol CO 2 m −2 s −1 ) (Martinelli et al , 2007; Aidar et al , 2010, 2014; Dinakar et al , 2012). This is in agreement with the slow growth described for R. myconi , which shows high longevity (Riba et al , 2002; Tóth et al , 2004; Dubreuil et al , 2008), and with its shade‐adaption strategy.…”

Section: Discussionsupporting

confidence: 72%

Born to revive: molecular and physiological mechanisms of double tolerance in a paleotropical and resurrection plant

et al. 2020

View full text Add to dashboard Cite

Summary Resurrection plants recover physiological functions after complete desiccation. Almost all of them are native to tropical warm environments. However, the Gesneriaceae include four genera, remnant of the past palaeotropical flora, which inhabit temperate mountains. One of these species is additionally freezing‐tolerant: Ramonda myconi. We hypothesise that this species has been able to persist in a colder climate thanks to some resurrection‐linked traits. To disentangle the physiological mechanisms underpinning multistress tolerance to desiccation and freezing, we conducted an exhaustive seasonal assessment of photosynthesis (gas exchange, limitations to partitioning, photochemistry and galactolipids) and primary metabolism (through metabolomics) in two natural populations at different elevations. R. myconi displayed low rates of photosynthesis, largely due to mesophyll limitation. However, plants were photosynthetically active throughout the year, excluding a reversible desiccation period. Common responses to desiccation and low temperature involved chloroplast protection: enhanced thermal energy dissipation, higher carotenoid to Chl ratio and de‐epoxidation of the xanthophyll cycle. As specific responses, antioxidants and secondary metabolic routes rose upon desiccation, while putrescine, proline and a variety of sugars rose in winter. The data suggest conserved mechanisms to cope with photo‐oxidation during desiccation and cold events, while additional metabolic mechanisms may have evolved as specific adaptations to cold during recent glaciations.

show abstract

Section: Discussionsupporting

confidence: 72%

Born to revive: molecular and physiological mechanisms of double tolerance in a paleotropical and resurrection plant

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Furthermore, in our study, activation of non‐photochemical processes, such as NPQ increase, appeared to cease in completely desiccated leaves. Similar dehydration effects were reported in B. purpurea with NPQ values close to zero under desiccation (Aidar et al, 2014).…”

Section: Discussionsupporting

confidence: 85%

“…In the last years, understanding the mechanisms behind vegetative desiccation tolerance has gained great importance due to climate change. Although the Brazilian flora is rich in desiccation-tolerant species, few studies have focused on Brazilian angiosperms (Aidar et al, 2010(Aidar et al, , 2014Alcantara et al, 2015;Nascimento et al, 2020;Suguiyama et al, 2014). Studies correlating ecophysiological, metabolic and structural responses as survival strategies to desiccation in plants growing on rocky outcrops are even more scarce.…”

Section: Introductionmentioning

confidence: 99%

Water retention and metabolic changes improve desiccation tolerance in Barbacenia graminifolia (Velloziaceae)

Vieira

Silva

Rossi

et al. 2022

Physiologia Plantarum

View full text Add to dashboard Cite

Barbacenia graminifolia is a Velloziaceae species endemic to the campos rupestres in Serra do Cip o, Minas Gerais state (Brazil). This biome is characterised by high irradiance and limited water conditions. Unlike other resurrection plants, B. graminifolia can maintain a high hydric status (>80%) after 28 days of water suppression before desiccation. We investigated the physiological and metabolic mechanisms associated with structural changes that allow B. graminifolia to maintain hydration under a prolonged water deficit and to recover after desiccation. After 30 days of water deficit, desiccated plants exhibited chlorophyll degradation, a 178.4% and 193.7% increase in total carotenoids and MDA, respectively, and twice the CAT and APX activity compared to hydrated plants. The metabolite profile showed increased amino acids, carbohydrates, saturated fatty acids and benzoic acids during dehydration, while trichloroacetic acid cycle acids were higher in hydrated and rehydrated plants. Anatomical and ultrastructural data corroborated the physiological and metabolic changes and revealed the presence of mucilaginous cells with high water retention capacity. Our data indicated that combined strategies of assimilatory metabolism

show abstract

“…度有逐年增加的趋势, 这种现象在干旱和半干旱地区尤为明显 (Ghannoum, 2009) (Galmés et al, 2007;McDowell et al, 2008;Chaves et al, 2009)。旱后复水能够使植物的生理功能得到恢复, 可在一定程度上弥补干旱对植物造成的伤害 (山仑, 2003), 提高植物的光合速率并使其生长加速 (Fortunati et al, 2008;罗宏海等, 2008;Aidar et al, 2014;厉广辉等, 2014)。不过, 干旱后复水对植物生长上的补偿往往是有限的, 植株生长的恢复程度可能与复水前干旱的胁迫程度和持续时间有关 (刘晓英等, 2001;Xu & Zhou, 2007;。当经历过水分胁迫及复水的植物再次遇到干旱时, 植物对干旱适应性的增强可能与耐受基因的转录、渗透调节和抗氧化能力有关, 从而可在生理、生化和分子水平上具有更好地适应和抵抗干旱的能力 (Ruiz-Sánchez et al, 2000;Villar-Salvador et al, 2004;Bruce et al, 2007;徐芬芬等, 2009;Luo et al, 2011;Ding et al, 2012; 荣智媛等, 2012; 徐超华等, 2012)。不过, 也有研究显示, 经历过干旱胁迫的植物再次遇到干旱时并没有提高自身抵御干旱的能力 (Lloret et al, 2004;Zavalloni et al, 2008;Walter et al, 2011)…”

Section: 随着全球气候不断变化干旱发生的频率和强unclassified

Effects of drought-rewatering-drought on photosynthesis and growth of maize

Wen-Sai¹,

Sun²,

Liu³

2016

Chinese Journal of Plant Ecology

View full text Add to dashboard Cite

Aims Our objective was to investigate the responses of maize photosynthesis and growth to repeated drought. Methods Maize seedlings were exposed to different soil water deficit for three weeks, then rewatering for one week, and again to different water deficit for three weeks, to examine the effects of repeated drought on photosynthesis and growth. Important findings After the first water deficit treatments, under severe drought, plant height, total leaf area of individual plant, shoot and root biomass declined significantly, also transpiration rate (T r), stomatal conductance (G s), intercellular CO 2 concentration (C i), net photosynthetic rate (P n), maximum net photosynthetic rate (A max), but light compensation point and dark respiration rate increased significantly. Under medium drought, plant height, leaf area, and shoot biomass decreased significantly, but root biomass did not vary, hence, the ratio of roots to shoots (R/S) increased. Moreover, plants did not show significant differences in photosynthetic parameters. After rewatering, photosynthesis and growth rate of plants previously exposed to water deficit could recover to the levels of well-watered plants, but plant height and leaf area did not recover to the levels of the control. When maize were subjected to recurrent drought, plants pre-exposed to medium drought showed no significant difference in plant height, biomass, and photosynthetic parameters, but a significant decrease in leaf area, compared to plants only exposed to second medium drought. Plants pre-exposed to severe drought had significantly higher T r , G s , C i , P n , A max , and, apparent quantum yield but significantly lower plant height, leaf area, and biomass than plants without previous exposure. These results indicated that the first severe drought significantly reduced

show abstract

Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration

Cited by 14 publications

References 33 publications

Born to revive: molecular and physiological mechanisms of double tolerance in a paleotropical and resurrection plant

Born to revive: molecular and physiological mechanisms of double tolerance in a paleotropical and resurrection plant

Water retention and metabolic changes improve desiccation tolerance in Barbacenia graminifolia (Velloziaceae)

Effects of drought-rewatering-drought on photosynthesis and growth of maize

Contact Info

Product

Resources

About