Leaf demography and photosynthesis as affected by the environment in the drought semi-deciduous Mediterranean shrub Phlomis fruticosa L.

Kyparissis, Aris; Grammatikopoulos, George; Manetas, Yiannis

doi:10.1016/s1146-609x(97)80040-9

Cited by 39 publications

(35 citation statements)

References 10 publications

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“…3) as previously reported for shoot length, leaf size or leaf area index in Mediterranean species (Kyparissis et al 1997;Kramer et al 2000;Mutke et al 2003). In addition, autumn stem elongation of G. alypum and P. halepensis, was also related to soil moisture.…”

Section: Discussionsupporting

confidence: 64%

Effects of experimental warming and drought on biomass accumulation in a Mediterranean shrubland

et al. 2009

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We studied the effects of experimental warming and drought on the plant biomass of a Mediterranean shrubland. We monitored growth at plant level and biomass accumulation at stand level. The experimentation period stretched over 7 years (1999)(2000)(2001)(2002)(2003)(2004)(2005) and we focused on the two dominant shrub species, Erica multiflora L. and Globularia alypum L. and the tree species Pinus halepensis L. The warming treatment increased shoot elongation in E. multiflora, and the drought treatment reduced shoot elongation in G. alypum. The elongation of P. halepensis remained unaffected under both treatments. The balance between the patterns observed in biomass accumulation for the three studied species in the drought plots (reduction in E. multiflora and P. halepensis and increase in G. alypum) resulted in a trend to reduce 33% the biomass of the drought treatment plots with respect to the untreated plots, which almost doubled their biomass from 1998 to 2005. The results also suggest that under drier conditions larger accumulation of dead biomass may occur at stand level, which combined with higher temperatures, may thus increase fire risk in the Mediterranean area.

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Section: Discussionsupporting

confidence: 64%

Effects of experimental warming and drought on biomass accumulation in a Mediterranean shrubland

et al. 2009

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“…In the present work we investigated PSII resistance to water stress in seedlings of the malacophyllous, dimorphic, semi-deciduous Mediterranean shrub Phlomis fruticosa L. Overall photosynthesis (gas exchange measurements), as well as ecophysiology of mature plants of P. fruticosa have been thoroughly investigated in our laboratory and a big repertoire of adaptations (morphological, biochemical and physiological) against adverse Mediterranean summer has been found (Grammatikopoulos and Manetas 1994, Grammatikopoulos et al 1995, Kyparissis et al 1997, Grammatikopoulos 1999, Karavatas and Manetas 1999, Kyparissis et al 2000. However, seedlings and young plants are expected to be more sensitive to water stress than their mature individuals (Fenner 1987, Padilla and Pugnaire 2007, Fotelli et al 2000.…”

Section: Introductionmentioning

confidence: 99%

Drought resistance and recovery of photosystem II activity in a Mediterranean semi-deciduous shrub at the seedling stage

Petsas¹,

Grammatikopoulos²

2009

Photosynt.

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Phlomis fruticosa is one of the main species of post-fire Mediterranean communities, occupying areas with post-fire grazing or altered precipitation pattern and consequently water stress imposed on seedlings of co-occurring species. Seedlings of woody perennials often differ from their mature individuals regarding their resistance of photosynthetic performance to environmental stresses. Such differences have been reported for tree species but there is a lack of information regarding shrub species. In the present study, we tried to detect changes in (PSII) activity imposed by water stress in P. fruticosa seedlings as well as its capability for recovery after rehydration. Maximum PSII photochemical efficiency decreased only under severe water stress exactly as in mature plants in the field. However, leaf chlorophyll (Chl) content was almost stable regardless of leaf relative water content (RWC). We assume that the photoprotective chlorophyll loss process, reported for many mature Mediterranean species (including P. fruticosa), has not yet been developed at the seedling stage. On the other hand, photoprotection through an increase of the relative amount of non-Q B -reducing centers was found during dehydration. Non-photochemical quenching (NPQ) contributed to protection from photodamage until moderate water stress but was significantly suppressed under severe water stress. Both processes were reversed after rehydration. The above characteristics enabled seedlings not only to survive during aggravating drought but also to maintain a considerable part of their effective quantum yield and perform significant electron transport even at extremely low relative water content (RWC). This was confirmed with measurements in a semi-natural environment (pots) and under real steady state conditions regarding adaptation of the photosynthetic machinery to prevailing light intensities.

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“…It is a characteristic vegetation type of the Mediterranean ecosystems that usually grows on dry, rocky and friable soils (Debazac and Mavrommatis, 1969;Kyparissis et al, 1997;Cherubini et al, 2003). Phrygana have adopted a peculiar strategy to withstand the summer droughtstress of the Mediterranean climate by replacing the large winter leaves by the much smaller summer ones in order to conserve water (Kypasissis and Manetas, 1993;Kyparissis et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Nutritional Quality of Herbaceous Vegetation in a Phryganic Mediterranean Ecosystem During the Grazing Period

Roukos

Kyriazopoulos

Abraham

et al. 2017

Not Bot Horti Agrobo

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Grazing is an economically and environmentally valuable activity in phryganic Mediterranean ecosystems. The herbaceous vegetation of these ecosystems provides an essential feed source for grazing ruminants. Despite the extension and economic importance of phryganic ecosystems in Mediterranean Basin there has been relatively little scientific focus on nutritional quality of their herbaceous vegetation. The nutritional quality of herbaceous vegetation in a phryganic ecosystem was assessed for two consecutive years during the grazing period (March to July). Herbage samples were analysed for chemical composition, metabolizable energy, in vitro dry matter digestibility, in vitro neutral detergent fiber digestibility and mineral content (Ca, P, K, Mg) at monthly basis. According to the results time of harvest significantly affected crude protein, neutral detergent fiber, acid detergent fiber, lignin and the content of minerals (i.e. Ca, P, Mg, K). Mean monthly temperature found to have a great negative impact on nutritional quality. During the grazing period, the nutritional quality of herbage vegetation was strongly correlated with growing degree days. Over a threshold of about 700 growing degree days the nutritional quality of herbage dramatically decreased. Overall the current study provides crucial information for the nutritional dynamics of the herbage vegetation of the phryganic Mediterranean ecosystems that can be towards developing an efficient grazing strategy.

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Leaf demography and photosynthesis as affected by the environment in the drought semi-deciduous Mediterranean shrub Phlomis fruticosa L.

Cited by 39 publications

References 10 publications

Effects of experimental warming and drought on biomass accumulation in a Mediterranean shrubland

Effects of experimental warming and drought on biomass accumulation in a Mediterranean shrubland

Drought resistance and recovery of photosystem II activity in a Mediterranean semi-deciduous shrub at the seedling stage

Nutritional Quality of Herbaceous Vegetation in a Phryganic Mediterranean Ecosystem During the Grazing Period

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