Resilience of rice (Oryzaspp.) pollen germination and tube growth to temperature stress


Autoria(s): Coast, Onriode; Murdoch, Alistair J.; Ellis, Richard H.; Hay, Fiona R.; Jagadish, Krishna S. V.
Data(s)

2016

Resumo

Resilience of rice cropping systems to potential global climate change will partly depend on temperature tolerance of pollen germination (PG) and tube growth (PTG). Germination of pollen of high temperature susceptible Oryza glaberrima Steud. (cv. CG14) and O. sativa L. ssp. indica (cv. IR64) and high temperature tolerant O. sativa ssp. aus (cv. N22), was assessed on a 5.6-45.4°C temperature gradient system. Mean maximum PG was 85% at 27°C with 1488 μm PTG at 25°C. The hypothesis that in each pollen grain, minimum temperature requirements (Tn) and maximum temperature limits (Tx) for germination operate independently was accepted by comparing multiplicative and subtractive probability models. The maximum temperature limit for PG in 50% of grains (Tx(50)) was lowest (29.8°C) in IR64 compared with CG14 (34.3°C) and N22 (35.6°C). Standard deviation (sx) of Tx was also low in IR64 (2.3°C) suggesting that the mechanism of IR64's susceptibility to high temperatures may relate to PG. Optimum germination temperatures and thermal times for 1mm PTG were not linked to tolerating high temperatures at anthesis. However, the parameters Tx(50) and sx in the germination model define new pragmatic criteria for successful and resilient PG, preferable to the more traditional cardinal (maximum and minimum) temperatures.

Formato

text

Identificador

http://centaur.reading.ac.uk/37985/1/Coast%20et%20al%20Main%20document%20Pollen%20Germination%20final%20%283%29.pdf

Coast, O., Murdoch, A. J. <http://centaur.reading.ac.uk/view/creators/90000120.html>, Ellis, R. H. <http://centaur.reading.ac.uk/view/creators/90000125.html>, Hay, F. R. and Jagadish, K. S. V. (2016) Resilience of rice (Oryzaspp.) pollen germination and tube growth to temperature stress. Plant, Cell & Environment, 39 (1). pp. 26-37. ISSN 0140-7791 doi: 10.1111/pce.12475 <http://dx.doi.org/10.1111/pce.12475>

Idioma(s)

en

Publicador

Wiley

Relação

http://centaur.reading.ac.uk/37985/

creatorInternal Murdoch, Alistair J.

creatorInternal Ellis, Richard H.

http://dx.doi.org/10.1111/pce.12475

10.1111/pce.12475

Tipo

Article

PeerReviewed