+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Photoperoid X temperature interactions in contrasting wheat genotypes: Time to heading and final leaf number



Photoperoid X temperature interactions in contrasting wheat genotypes: Time to heading and final leaf number



Field Crops Research 44(2-3): 73-83



This paper describes the effects of photoperiod (9, 12, 15, 17, 19 and 21 h) and temperature (21/17 and 16/12 degree C maximum/minimum) on time to heading in wheat. Two spring wheats (a non-segregating awned selection of Sunset, and Condor), a semiwinter wheat (Rosella), and a winter wheat (Cappelle Desprez) were used. The last three genotypes respond to vemalisation and so were exposed to 4 degree C for 60 d before transfer to the photoperiod and temperature treatments. Increases in both photoperiod and temperature always reduced time to heading, although genotypes differed in the magnitude of the responses. However, the responses to temperature were markedly affected by photoperiod. Thus, in the three genotypes that were vernalized, thermal time to heading under short photoperiods was longer at 21/17 than at 16/12 degree C, but under long photoperiods thermal time was shorter at 21/17 degree C. Also, the optimum photoperiod was always longer at 21/17 degree C than at 16/12 degree C. Most importantly, the magnitude of the response to photoperiod was dependent on temperature, and varied among genotypes. A numerical description of wheat development to heading is proposed which includes the effects of photoperiod not only on thermal time but also on base temperature. Differential responses to very short photoperiods were evident among genotypes. Cappelle Desprez did not head when plants were grown under photoperiods shorter than 12 h (i.e. a qualitative response to photoperiod), whereas Sunset, at the other extreme, had a clear quantitative response with a progressive delay in heading as photoperiod decreased. Condor and Rosella had intermediate quantitative responses, reaching heading even under the shortest photoperiod, but responding to very short photoperiods much more dramatically than to intermediate photoperiods. This suggests that for a genotype, more than one degree of sensitivity to photoperiod is possible. The genotype X temperature interaction was responsible for changes in time to heading of more than 2 weeks under a 21-h photoperiod. Final leaf number on the main culm increased with shorting photoperiod, but was unaffected by temperature. Although time to heading was always linearly related to final leaf number, the pattern of response varied. The optimum photoperiod was much shorter for final leaf number than for time to heading, the relative sensitivity to photoperiod was less, and the change in sensitivity at very short photoperiod was not evident in final leaf number. These results suggest that photoperiod acted at least partially independently on the timing of heading and on final leaf number.

Please choose payment method:






(PDF emailed within 1 workday: $29.90)

Accession: 009191229

Download citation: RISBibTeXText


Related references

Photoperiod (times) temperature interactions in contrasting wheat genotypes: time to heading and final leaf number. Field Crops Research 44: 83, 1995

Photoperiodxtemperature interactions in contrasting wheat genotypes: Time to heading and final leaf number. Field Crops Research 44(2/3): 73-83, 1996

Heading date and final leaf number as affected by sowing date and prediction of heading date based on leaf appearance model in rice. Korean Journal of Crop Science 46(3): 195-201, 2001

Stimulation of wheat ontogenesis ii. effect of variety nitrogen fertilization and water stress on leaf appearance and final leaf number in the field. Climate Research 1(3): 233-242, 1991

Heritable heading time variation in wheat lines with the same number of Ppd-B1 gene copies. Plos One 12(8): E0183745-E0183745, 2017

Evaluation of contrasting cellular-level acclimation responses to leaf water deficits in three wheat genotypes. Plant Science 86(1): 1-12, 1992

Contrasting leaf Na+ uptake and transport rates conferred differences in salt tolerance of wheat genotypes. Acta Agriculturae Scandinavica Section B-Soil and Plant Science 61(2): 129-135, 2011

The influence of daylength on final leaf number in spring wheat. Field Crops Research 41(3): 155-165, 1995

Relation between vernalization response and final leaf number in wheat. Acta Agronomica Sinica 23(6): 746-752, 1997

Inheritance of heading time tiller number and plant height in 8 wheat triticum aestivum crosses. Bangladesh Journal of Botany 12(2): 119-124, 1983

Heritable heading time variation in wheat lines with the same number of Ppd-B1 gene copies (vol 12, e0183745, 2017). PLoS ONE 13(2): e0192989, 2018

High-temperature-induced antioxidative defense mechanism in seedlings of contrasting wheat genotypes. Indian Journal of Plant Physiology 10(1): 73-75, 2005

Effect of temperature during growth on leaf anatomy and subsequent light-saturated photosynthesis among contrasting Lolium genotypes. New Phytol 68: 4, 1115-23. Bibl. 10, 1969

Contrasting stomatal regulation and leaf ABA concentrations in wheat genotypes when split root systems were exposed to terminal drought. Field Crops Research 162: 77-86, 2014

Effect of chemical desiccation at the post-anthesis stage on some physiological and biochemical changes in the flag leaf of contrasting wheat genotypes. Field Crops Research 77(1): 1-6, 2002