[Seasonal differences in the leaf hydraulic conductance of mature Acacia mangium in response to its leaf water use and photosynthesis].

In this study, measurements were made on the leaf water potential (psi1), stomatal conductance (g(s)), transpiration rate, leaf area index, and sapwood area of mature Acacia mangium, aimed to understand the relationships of the leaf hydraulic conductance (K1) with the leaf water use and photosynthetic characteristics of the A. mangium in wet season (May) and dry season (November). The ratio of sapwood area to leaf area (A(sp)/A(cl)) of the larger trees with an average height of 20 m and a diameter at breast height (DBH) of 0.

[Net CO2 exchange and carbon isotope flux in Acacia mangium plantation].

By using stable carbon isotope technique, the leaf-level 13C discrimination was integrated to canopy-scale photosynthetic discrimination (Deltacanopy) through weighted the net CO2 assimilation (Anet) of sunlit and shaded leaves and the stand leaf area index (L) in an A. mangium plantation, and the carbon isotope fluxes from photosynthesis and respiration as well as their net exchange flux were obtained. There was an obvious diurnal variation in Deltacanopy, being lower at dawn and at noon time (18.

[Responses of mesophyllic conductance in leaves of 4 dominant subtropical forest tree species to moderate high temperature].

By using CO2 exchange system and chlorophyll fluorescence method, the magnitude of mesophyllic conductance (g(m)), namely the CO2 transfer conductance from intercellular space to chloroplast, in the leaves of four dominant subtropical forest tree species under moderate high temperature (38 degrees C) was studied. The results revealed that sun or early-successional species Schima superba had a higher g(m) than mesophytic and shade-tolerant species, such as Castanopsis hystrix, C. fissa and Cryptocarya concinna, and the leaves under full direct light had a higher g(m) than those under shade.

Protection of ultrastructure in chilling-stressed banana leaves by salicylic acid.

Objective: Chilling tolerance of salicylic acid (SA) in banana seedlings (Musa acuminata cv., Williams 8818) was investigated by changes in ultrastructure in this study.

Methods: Light and electron microscope observation.

[Characteristics of CO2, CH4 and N2O emissions from winter-fallowed paddy fields in hilly area of South China].

With closed static chamber and modified gas chromatograph (HP5890 II), the in situ measurements were made on the CO2, CH4 and N2O emissions from winter-fallowed paddy fields in the hilly area of South China. Gas samples were taken simultaneously from the fields with and without rice stubble. The results showed that both of the fields had the peak value of CO2 flux in the late afternoon.

Isolations of salicylic acid-induction-expressed genes in chilling-stressed banana seedling leaves using mRNA differential display.

The mRNA differential display method was applied to identify banana genes that were regulated by salicylic acid (SA) during chilling stress. Eighteen cDNA fragments induced by SA during chilling stress were retracted. Seven of them were affirmed by reverse Northern hybridization to be significantly induced.