Agrobacterial ipt gene for cytokinin biosynthesis is found in phototrophic non-sulfur purple bacteria Rhodobacter sphaeroides and Rhodopseudomonas palustris

2017 ◽  
Vol 53 (10) ◽  
pp. 1113-1118
Author(s):  
O. P. Serdyuk ◽  
G. N. Shirshikova ◽  
L. D. Smolygina ◽  
A. M. Butanaev ◽  
V. D. Kreslavsky ◽  
...  
Keyword(s):  
Rhodobacter Sphaeroides ◽  
Purple Bacteria ◽  
Rhodopseudomonas Palustris ◽  
Ipt Gene ◽  
Cytokinin Biosynthesis

Promotion of shoot development and tuberisation in potato by expression of a chimaeric cytokinin synthesis gene at normal and elevated CO2 levels

2010 ◽  
Vol 37 (1) ◽  
pp. 43 ◽  
Author(s):  
Guo-Qing Tao ◽  
D. Stuart Letham ◽  
Jean W. H. Yong ◽  
Kerong Zhang ◽  
Peter C. L. John ◽  
...  
Keyword(s):  
Gene Expression ◽  
Solanum Tuberosum L ◽  
Shoot Development ◽  
Main Stem ◽  
Stem Length ◽  
Tuber Weight ◽  
Ipt Gene ◽  
Cytokinin Biosynthesis ◽  
Node Number ◽  
Apical Bud

The bacterial cytokinin biosynthesis gene ipt under control of a chalcone synthase promoter (PCHS) was introduced into potato (Solanum tuberosum L.). Two transgenic lines were selected for detailed study, because in these, root development was reduced only moderately, thus, enabling the plants to be grown in pots. Expression of the PCHS-ipt gene elevated the level of zeatin cytokinins markedly in the apical bud, subapical stems and leaves. The transgenic (IPT) plants exhibited a lower and denser leaf canopy relative to wild-type (WT) plants owing to reduction in main stem length, increase in node number per stem and promotion of lateral shoot development. Main stem diameter was increased markedly due to promotion of cell division associated with activation of cyclin-dependent kinase in the subapical stem. Expression of the PCHS-ipt gene induced aerial stolons, promoted growth of underground stolons and increased tuber number but reduced tuber weight and nitrogen content. The gene expression also increased pinnae and pinnule number per leaf, increased thickness of pinnae and promoted transpiration, photosynthesis and stomatal conductance – effects monitored by gas exchange and 18O and 13C analysis. The elevation of [CO2] to 900 μmol mol–1 promoted growth of both WT and IPT plants, ameliorated the negative effect of high cytokinin on tuber weight and interacted additively with ipt gene expression to promote stem growth.

scholarly journals Energy dissipative photoprotective mechanism of carotenoid spheroidene from the photoreaction center of purple bacteria Rhodobacter sphaeroides

2015 ◽  
Vol 17 (36) ◽  
pp. 23468-23480 ◽  
Author(s):  
Sundaram Arulmozhiraja ◽  
Naoki Nakatani ◽  
Akira Nakayama ◽  
Jun-ya Hasegawa
Keyword(s):  
Energy Dissipation ◽  
Rhodobacter Sphaeroides ◽  
Purple Bacteria ◽  
Minimum Energy ◽  
Intersystem Crossing ◽  
Triplet Energy ◽  
Energy Dissipation Mechanism ◽  
Dissipation Mechanism ◽  
Crossing Point

Triplet energy dissipation mechanism of a carotenoid: just bond twisting and stretching lead to minimum energy intersystem crossing point.

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