Quantifying Light Response of Leaf-Scale Water-Use Efficiency and Its Interrelationships With Photosynthesis and Stomatal Conductance in C and C Species.

Light intensity () is the most dynamic and significant environmental variable affecting photosynthesis ( ), stomatal conductance ( ), transpiration ( ), and water-use efficiency (WUE). Currently, studies characterizing leaf-scale WUE- responses are rare and key questions have not been answered. In particular, (1) What shape does the response function take? (2) Are there maximum intrinsic (WUE; WUE) and instantaneous WUE (WUE; WUE) at the corresponding saturation irradiances ( and )? This study developed WUE- and WUE- models sharing the same non-asymptotic function with previously published - and - models.

[Photosynthetic physio-ecological characteristics in soybean leaves at different CO concentrations].

The availability of CO, a substrate for photosynthesis, affects the photosynthesis process and photosynthate production. Using the Li-6400-40B, we measured the photosynthetic electron transport rate and the photosynthetic light-response curves of soybean (Glycine max) leaves at different CO concentrations (300, 400, 500 and 600 μmol·mol). By fitting these parameters with a mechanistic model characterizing the light response of photosynthesis, we obtained aseries of photosynthetic parameters, eco-physiological parameters, as well as the physical parameters of photosynthetic pigments.

Genetical and molecular analysis reveals a cooperating relationship between cytoplasmic male sterility- and fertility restoration-related genes in Oryza species.

Although the characterization of genes associated with cytoplasmic male sterility (CMS) and fertility restoration (Rf) has been well documented, the evolutionary relationship between nuclear Rf and CMS factors in mitochondria in Oryza species is still less understood. Here, 41 accessions from 7 Oryza species with AA genome were employed for analyzing the evolutionary relationships between the CMS factors and Rf candidates on chromosome 10. The phylogenetic tree based on restriction fragment length polymorphism patterns of CMS-associated mitochondrial genes showed that these 41 Oryza accessions fell into 3 distinct groups.

[Distribution and SNPs of the rice CMS-related gene in AA-genome of Oryza species].

The moiety of a chimeric gene in mitochondrial genome, orf79 and orfH79, probably related to BT-type and HL-type CMS of rice respectively, has 98% homology and only 4 nucleotide variation in DNA sequence. Of which, the former comes from Oryza sativa L., and the latter originates from Oryza rufipogon Griff.

[Genetic analysis and identification of three groups three-line hybrid rice and their parents by RAPD markers].

A total of 248 arbitrary 10-mer oligonucleotide primers were screened using RAPD (random amplified polymorphic DNA) techniques with the genome DNA of three groups of three-line hybrid rice and their parents. Thirteen primers produced 43 polymorphism fragments. Six primers of them produced 20 obviously repeatable polymorphic markers among rice lines tested.

[Genetic variation of main restorer lines of hybrid rice in China was revealed by microsatellite markers].

A total of thirty-five restorer lines of hybrid rice (Oryza sativa L.) were analyzed by twenty-five SSR (simple sequence repeats) primer pairs, which disperse on 12 chromosomes in rice. Those primers detected 65 alleles among 35 restorer lines of hybrid rice.