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The PSI-H subunit of photosystem I is essential for state transitions in plant photosynthesis
TLDR
It is shown that in the absence of a specific PSI subunit, PSI-H, LHCII cannot transfer energy to PSI, and state transitions are impaired.
The Selaginella Genome Identifies Genetic Changes Associated with the Evolution of Vascular Plants
TLDR
The genome sequence of the lycophyte Selaginella moellendorffii (Selaginella), the first nonseed vascular plant genome reported, is reported, finding that the transition from a gametophytes- to a sporophyte-dominated life cycle required far fewer new genes than the Transition from a non Seed vascular to a flowering plant.
ARABINAN DEFICIENT 1 Is a Putative Arabinosyltransferase Involved in Biosynthesis of Pectic Arabinan in Arabidopsis1[W]
TLDR
Analysis of mutant lines with T-DNA insertion in the ARABINAN DEFICIENT 1 gene suggested that ARAD1 is an arabinan α-1,5-arabinosyltransferase, a putative glycosyl transferase of type 2 membrane protein with a signal anchor in Arabidopsis.
Biosynthesis of pectin
TLDR
Biochemical methods successfully led to the recent identification of a pectin biosynthetic galacturonosyltransferase (GAUT1), and recent functional genomics and mutant studies have allowed the identification of several biosynthetics enzymes involved in making different parts of pectIn several other cases, enzymes have been identified as involved inMaking pect in but because of ambiguity in the cell wall compositions of mutants and lack of direct biochemical evidence their specific activities are more uncertain.
Xylan biosynthesis.
Photoinhibition of photosystem I
TLDR
Recently, the structure of PSI isolated from pea was solved by X-ray crystallography at a resolution of 4.4 A, which highlighted the structural similarities and differences between plant PSI and cyanobacterial PSI.
Arabidopsis CHL27, located in both envelope and thylakoid membranes, is required for the synthesis of protochlorophyllide
TLDR
Fractionation of Arabidopsis chloroplast membranes shows that Crd1/CHL27 is equally distributed on a membrane-weight basis in the thylakoid and inner-envelope membranes.
The PSI-K Subunit of Photosystem I Is Involved in the Interaction between Light-harvesting Complex I and the Photosystem I Reaction Center Core*
TLDR
The observed effects demonstrate that PSI-K has a role in organizing the peripheral light-harvesting complexes on the core antenna of photosystem I and reduces the redistribution of absorbed excitation energy between the two photosystems.
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