caa a22 4500 477100066 CHVBK 20180405111538.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00196660 doi (NATIONALLICENCE)springer-10.1007/BF00196660 High-irradiance responses induced by far-red light in grass seedlings of the wild type or overexpressing phytochrome A [Elektronische Daten] [J. Casal, R. Clough, R. Vierstra] The occurrence of phytochrome-mediated highirradiance responses (HIR), previously characterised largely in dicotyledonous plants, was investigated in Triticum aestivum L., Zea mays L., Lolium multiflorum Lam. and in both wild-type Oryza sativa L. and in transgenic plants overexpressing oat phytochrome A under the control of a 35S promoter. Coleoptile growth was promoted (maize, ryegrass) or inhibited (wild-type rice) by continuous far-red light (FRc). However, at equal fluences, hourly pulses of far-red light (FRp) were equally effective, indicating that the growth responses to FRc were not true HIR. In contrast, in maize and rice, FRc increased anthocyanin content in the coleoptile in a fluence-rate dependent manner. This response was a true HIR as FRp had reduced effects. In maize, anthocyanin levels were significantly higher under FRc than under continuous red light. In rice, overexpression of phytochrome A increased the inhibition of coleoptile growth and the levels of anthocyanin under FRc but not under FRp or under continuous red light. The effect of FRc was fluence-rate dependent. In light-grown rice, overexpression of phytochrome A reduced leaf-sheath length, impaired the response to supplementary far-red light, but did not affect the response to canopy shade-light. In grasses, typical HIR, i.e. fluence-rate dependent responses showing reciprocity failure, can be induced by FRc. Under FRc, overexpressed phytochrome A operates through this action mode in transgenic rice. Springer-Verlag, 1996 Anthocyanin nationallicence Coleoptile growth nationallicence High-irradiance reaction nationallicence Oryza nationallicence Phytochrome A nationallicence Transgenic plants nationallicence FR : far-red light nationallicence FRc : continuous far-red light nationallicence FRp : pulses of far-red light nationallicence HIR : high-irradiance responses nationallicence LFR : low-fluence responses nationallicence OPHYA : transgenic rice overexpressing oat phytochrome A nationallicence Pfr : far-red light-absorbing form of phytochrome nationallicence phyA : phytochrome A nationallicence R : red light nationallicence Rc : continuous red light nationallicence VLFR : very low-fluence responses nationallicence WT : wildtype nationallicence Casal J. IFEVA, Departamento de Ecología, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martin 4453, 1417, Buenos Aires, Argentina aut Clough R. Department of Horticulture, University of Wisconsin-Madison, 53706, Madison, WI, USA aut Vierstra R. Department of Horticulture, University of Wisconsin-Madison, 53706, Madison, WI, USA aut Planta Springer-Verlag 200/1(1996-09-01), 132-137 0032-0935 200:1<132 1996 200 425 https://doi.org/10.1007/BF00196660 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00196660 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Casal J. IFEVA, Departamento de Ecología, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martin 4453, 1417, Buenos Aires, Argentina aut NATIONALLICENCE 700 1- Clough R. Department of Horticulture, University of Wisconsin-Madison, 53706, Madison, WI, USA aut NATIONALLICENCE 700 1- Vierstra R. Department of Horticulture, University of Wisconsin-Madison, 53706, Madison, WI, USA aut NATIONALLICENCE 773 0- Planta Springer-Verlag 200/1(1996-09-01), 132-137 0032-0935 200:1<132 1996 200 425 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer