Plants mutants

The photoprotective role of carotenoids is demonstrated in plant mutants that cannot synthesize essential leaf carotenoids. These mutants are lethal in nature since without carotenoids, chlorophylls degrade, their leaves are white in color, and photosynthesis cannot occur. Generally, the carotenoids are effective for visible light but have no effects in ultraviolet, gamma, or x-radiation. The reactions are listed as follows ... 

Plant mutants and bacteria Tomato (Lycoperskon escideniwn) 18... 

Host Percent Wildtype Parent Killed Plants Mutant ... 

The simpler dimeric rubisco from Rhodospirillum is very inefficient in carboxylation and catalyzes much more oxygenation than do rubiscos of higher plants. Mutant enzymes that have impaired carboxylase and enhanced oxygenase are also known. ... 

The results of in vitro binding assays combined with in vivo studies and analyses of plant mutants have identified several macromolecules in the ECM that are Important for adhesion. For example, normal adhesion of pollen, which contains sperm cells, to the stigma or style in the female reproductive organ of the Easter lily requires a cystelne-rlch protein called stigma/stylar cystelne-rlch adhesin (SCA) and a specialized pectin that can bind to SCA (Figure 6-35). 

The biological function of some A. thaliana P450s have been elucidated in planta by taking advantage of the availability of knockout mutants in this model plant. Mutant collections have been... 

For many plant hormones, the use of forward genetic approaches has enabled the identification of the direct target proteins (also known as receptors) and other components of their signaling pathway. Along these lines, researchers screened for plant mutants that were insensitive to the corresponding phytohormone and - after analysis of these mutants - were able to identify key components of the corresponding signaling pathway [2]. 

Coupled with metabolite analyses of natural plant mutants and/or ecotypes deficient in particular compoimds as well as engineered plant lines silenced for particular P450s, these genomic and transcriptomic resources are providing details on the exceptionally large number of P450 transcripts expressed in different plant species, those co-regulated in branch pathways and metabolic interactions between primary and specialized compounds in individual species. 

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