Changing background color in eazydraw5/11/2023 ![]() ![]() The W7–2 displayed a normal green leaf phenotype at the seedling stage, but the inner leaves gradually turned yellow when the temperature was decreased to 10 ☌/2 ☌ (day/night), This study facilitates us to understand the physiological and molecular mechanisms underlying leaf color changes in response to low temperature.Ī comparative leaf transcriptome analysis of W7–2 under low temperature treatment was performed on three stages (before, during and after leaf color change) with leaves that did not change color under normal temperature at the same period as a control. In this study, the color conversion of inner-leaves from green to yellow in the new wucai ( Brassica campestris L.) cultivar W7–2 was detected under low temperature. In this work, we present and discuss the genetic methods needed to reveal natural genetic variation, and elaborate on how to apply this to improve crop photosynthesis.Ĭhlorophyll (Chl) is a vital photosynthetic pigment involved in capturing light energy and energy conversion. We will need to determine their physiological function, and design novel strategies to use this knowledge to improve crop photosynthesis through conventional plant breeding, based on readily available crop plant germplasm. We propose to take the genetics of photosynthesis to a higher level, and identify the genes and alleles nature has used for millions of years to tune photosynthesis to be in line with local environmental conditions. So far, hardly any of these QTLs are used in marker assisted breeding or genomic selection approaches to improve crop photosynthesis and yield, and hardly ever are the underlying causal genes identified. This is changing though, and increasingly more studies report on quantitative trait loci (QTLs) for photosynthetic phenotypes. ![]() The reason this has not been explored yet is that the variation probably involves thousands of genes, each contributing only little to photosynthesis, making them hard to identify without the proper phenotyping and genetic tools. Yet, phenotypic variation observed in wild species and between varieties of crop species, implies there is standing natural genetic variation for photosynthesis offering a largely unexplored resource to use for breeding crops with improved photosynthesis and higher yields. Since the basic biochemical mechanisms of photosynthesis are remarkably conserved among plant species, genetic modification approaches have so far been the main route to improve the photosynthetic performance of crops. The gene encodes the PSII associated protein PSB27 which has already been implicated in the adaptation to fluctuating light. ![]() One candidate for a cold specific QTL was validated with a mutant analysis to be one of the genes that is likely involved in the PSII response to the cold treatment. A genome wide association study identified several quantitative trait loci (QTLs) that are associated with changes in ΦPSII in low temperature. Observations were made over the course of several weeks in standard and low temperature conditions and a strong decrease in ΦPSII upon the cold treatment was found. Using an automated phenotyping platform for chlorophyll fluorescence imaging the steady state quantum yield of photosystem II (PSII) electron transport (ΦPSII) was measured and used to quantify the effect of moderately low temperature on a population of Arabidopsis thaliana natural accessions. Photosynthesis is one of the processes that are affected by low temperatures. Despite some molecular signalling pathways being known, the mechanisms causing different responses among genotypes are still poorly understood. Low, but non‐freezing, temperatures have negative effects on plant growth and development.
0 Comments
Leave a Reply. |