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Does habitat of Atriplex halimus L. affect plant strategy for osmotic adjustment?

100%

Hassine A. B., Bouzid S., Lutts S.

Acta Physiologiae Plantarum

2010

tom 32

nr 2

The impact of water stress was analysed in the xero-halophyte Mediterranean shrub Atriplex halimus using two Tunisian populations originating from a subhumid coastal site (Monastir) or from a semi-arid area (Kairouan). Seedlings were exposed for 10 days to nutrient solution containing either 0 or 15% polyethylene glycol. Water potential (Ψw), osmotic potential (Ψs), osmotic potential at full turgor [Ψs(100)], relative water content (RWC), shoot dry weight (DW) and changes in solute concentrations were quantified every 2 days throughout the stress period and inorganic solutes contents were determined at the end of the treatment. The water deficit induced a decrease in Ψw, Ψs and RWC in both populations, recorded changes being higher in plants of Monastir than those of Kairouan while the shoot dry weight was reduced in a similar extent in stressed plants from both populations. Water deficit induced an increase in proline, glycinebetaine and sugar concentrations. Proline accumulated as early as after the 24-h stress treatment while, glycinebetaine required more than 6 days of stress to accumulate. At the end of the stress period, the plants of Kairouan population accumulated higher amounts of proline than those of Monastir, while an opposite trend was reported for glycinebetaine. Both populations specifically accumulated Na⁺ in response to drought stress, suggesting that this element could play a physiological role in the stress response of this xero-halophyte species. Presented results suggest that the non-recyclable osmotic solute glycinebetaine does not necessarily preferentially accumulates in population facing permanent water stress and that other strategy than osmotic adjustment might be involved in drought tolerance of A. halimus.

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Canopy behavior of three milkvetch [Astragalus] species in acclimation to a new habitat

80%

Aniszewski T.

Acta Biologica Cracoviensia. Series Botanica

2010

tom 52

nr 1

45-54

Empirical data on functional growth dynamics are extremely limited for herbaceous plants and do not exist for milkvetch (Astragalus) species, although they are essential to an understanding a plant's ability to acclimate to a new habitat, which we need to know in order to predict its performance in future climate scenarios. The paper examines how species spread to a habitat in which they do not initially occur. It presents results on changes in growth, canopy behavior, competition ability and morphological traits of Cicer milkvetch (Astragalus cicer L.), Sweet milkvetch (Astragalus glycyphyllos L.) and Russian milkvetch (Astragalus falcatus Lam.) from a ten-year experiment. They successfully acclimated to a new habitat and presented clearly similar growth dynamics and similar strategies for establishing and maintaining populations. Developmental and reductional perennial phases were noted. The developmental phase showed slow and fast subphases. Canopy cover area peaked at the height of the developmental phase. Morphological parameters measured from parts of plants growing outside the experimental plot were greater than for plants growing inside it. Milkvetch species are good competitors. Unlike invasive species, their expansion strategy is not colonization-oriented. The data suggest that systematic and evolutionary studies on these species should pay attention to morphological changes.

Ograniczanie wyników

1 Acta Biologica Cracoviensia. Series Botanica

1 Acta Physiologiae Plantarum

1 Aniszewski T.

1 Bouzid S.

1 Hassine A. B.

1 Lutts S.

2 2010

Wyniki wyszukiwania

Does habitat of Atriplex halimus L. affect plant strategy for osmotic adjustment?

Canopy behavior of three milkvetch [Astragalus] species in acclimation to a new habitat