Photosynthetic and leaf respiration activity of Malcolmia littorea (L.) R. Br. in response to air temperature

Title:

Photosynthetic and leaf respiration activity of Malcolmia littorea (L.) R. Br. in response to air temperature

Creator:

Gratani, L., Catoni, R., and Varone, L.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:2f223e48-5091-4fd1-ac6c-906d66f547ca
uuid:2f223e48-5091-4fd1-ac6c-906d66f547ca
issn:0300-3604
doi:10.1007/s11099-011-0007-1

Subject:

air temperature, leaf respiration, leaf water potential, and photosynthesis

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Plant traits of Malcolmia littorea growing at the Botanic Garden of Rome and transplanted from the wild population developing along the Latium coast (Italy) were analyzed. The highest photosynthetic rates [PN, 22.5 ± 0.5 μmol(CO2) m-2 s-1], associated to the highest chlorophyll content (Chl, 60 ± 5 SPAD units), and respiration rates [R, 11.1 ± 0.2 μmol(CO2) m-2 s-1] were reached in spring, when mean air temperature (Tm) was in the range 17°C to 23°C. PN, Chl, and R decreased by 86, 38, and 59% in summer when mean maximum air temperature (Tmax) was 30.3 ± 2.6°C. Leaf water potential decreased by 34% in summer compared to the spring value, and it was associated to a relative water content (RWC) of 74 ± 4%, and to a water-use efficiency (WUE) of 2.15 ± 0.81 μmol(CO2) mmol-1(H2O). Moreover, also low air temperatures determined a significant PN and R decreases (by 52 and 40% compared to the maximum, respectively). Responsiveness of gross photosynthetic rate (Pg) to R was higher than that to PN as underlined by the slope of the regression line between the two variables. The results underlined a low tolerance to both high- and low air temperatures of M. littorea. The selected key traits (R, WUE, Chl) by the discriminant analysis might be used to monitor the M. littorea wild population in the long time. The ex situ cultivated plants could be propagated and used to increase the individuals number of the wild population. and L. Gratani ... [et al.].

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

65-74

Source:

Photosynthetica | 2011 Volume:49 | Number:1

Harvested from:

CDK

Metadata only:

false