caa a22 4500 445840560 CHVBK 20180317145342.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s00709-010-0235-4 doi (NATIONALLICENCE)springer-10.1007/s00709-010-0235-4 Early and late plastid development in response to chill stress and heat stress in wheat seedlings [Elektronische Daten] [Sasmita Mohanty, Baishnab Tripathy] Five-day-old etiolated wheat (Triticum aestivum L.) seedlings were transferred to 7°C (chill stress), 25°C (control), and 42°C (heat stress) and were kept in the dark or light for different time periods. Plastids were isolated from the control and stressed seedlings, and their low-temperature (77K) fluorescence emission spectra were monitored. Most of the Protochlorophyllide (Pchlide) present in heat-stressed etiolated seedlings were in nonphototransformable form. The phototransformable Pchlide (F657) rapidly decreased when 5-day-old etiolated seedlings were transferred to 42°C in the dark for 24h. A flash illumination of 0.2s given to etiolated heat-stressed seedlings resulted in substantial arrest of Shibata shift, while in chill-stress conditions, it was only partially affected. In high temperature, due to disaggregation of polymeric Pchlide-Pchlide oxidoreductase (POR)-nicotinamide adenine dinucleotide phosphate (NADPH) molecules, the conversion of nonphototransformable Pchlide to its phototransformable form is substantially delayed resulting in impaired Shibata shift and belated development of the core antenna CP47 Photosystem II (PSII). Chill stress, however, did not disaggregate the polymeric Pchlide-POR-NADPH molecule-suppressed Pchlide and Chl synthesis and impaired of the assembly of PSII core antenna CP47 that emits F695 and PSI that emits F735. The decreased gene/protein expression and reduced posttranslational import of plastidic proteins, importantly POR in temperature-stressed plants, may be responsible for the delay in conversion of nonphototransformable to phototransformable form of Pchlide and plastid biogenesis. Springer-Verlag, 2010 Chill stress nationallicence Chlorophyll biosynthesis nationallicence Chloroplast development nationallicence Heat stress nationallicence Protochlorophyllide oxidoreductase nationallicence Shibata shift nationallicence Temperature stress nationallicence Wheat nationallicence ALA : 5-Aminolevulinic acid nationallicence Chl : Chlorophyll nationallicence Chlide : Chlorophyllide nationallicence NADPH : Nicotinamide adenine dinucleotide phosphate nationallicence Pchlide : Protochlorophyllide nationallicence POR : Protochlorophyllide oxidoreductase nationallicence Mohanty Sasmita School of Life Sciences, Jawaharlal Nehru University, 110 067, New Delhi, India aut Tripathy Baishnab School of Life Sciences, Jawaharlal Nehru University, 110 067, New Delhi, India aut Protoplasma Springer Vienna 248/4(2011-10-01), 725-736 0033-183X 248:4<725 2011 248 709 https://doi.org/10.1007/s00709-010-0235-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00709-010-0235-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mohanty Sasmita School of Life Sciences, Jawaharlal Nehru University, 110 067, New Delhi, India aut NATIONALLICENCE 700 1- Tripathy Baishnab School of Life Sciences, Jawaharlal Nehru University, 110 067, New Delhi, India aut NATIONALLICENCE 773 0- Protoplasma Springer Vienna 248/4(2011-10-01), 725-736 0033-183X 248:4<725 2011 248 709 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer