Comparative study of temperature and light on vegetative growth of Epipremnum and Fatshedera : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Horticultural Science at Massey University
| dc.contributor.author | Christie, Colin Bruce | |
| dc.date.accessioned | 2021-12-08T23:21:55Z | |
| dc.date.available | 2021-12-08T23:21:55Z | |
| dc.date.issued | 1992 | |
| dc.description | Best copy available due to the binding. | en |
| dc.description.abstract | The relationship between temperature and light on vegetative growth of Epipremnum aureum (Linden and Andre) Bunt. and X Fatshedera lizei (Guillaum) plants was investigated in controlled environment study during the exponential growth phase. Normal and inverted day/night temperature treatments with means between 10 and 30 C were used. Maximum growth and development in Epipremnum aureum and X Fatshedera lizei occurred in constant temperature treatments at 28 ± 2 C and 22 ± 2 C, respectively. At less than 20 C relative growth rate and leaf area expansion rates for X Fatshedera lizei were usually higher than Epipremnum aureum. The difference between the two species decreased as the growth rate of Epipremnum aureum increased and X Fatshedera lizei decreased as the temperature was increased above 20 C. In both species growth in leaf area and rate of new leaf appearance were closely related to growth temperature and were less dependent on PFD. Leaf development was generally related to the sum of the rates at each temperature in the temperature regime. Growth and leaf development rates were similar in inverted and normal day/night temperature regimes. Leaf Chlorophyll was lower in high/low temperature (night/day) treatments. Epipremnum aureum was more chilling-sensitive than X Fatshedera lizei, exposure to 10 C for 4 hr decreased photosynthetic competence and plant growth. In constant day temperature (30 C) and normal night, split-night and sliding night temperatures with mean of 15 or 20 C growth of either species was similar at the same mean temperature. Growth of Epipremnum aureum was more acutely inhibited by the lower night temperatures than X Fatshedera /izei. Within each species equivalent growth and development occurred in treatments with the same mean temperature. Epipremnum aureum and X Fatshedera lizei were grown at in a controlled environment at 20 and 30 C. Intact leaves were exposed to a PFD of 1200 µmol·m⁻²·s⁻¹ at leaf temperatures between 15 and 30 C and photoinhibition of photosynthesis was followed by measuring the time courses of light-saturated net photosynthetic CO₂ uptake, photon yield of oxygen evolution and chlorophyll fluorescence kinetics at 77 K and 692 nm. Recovery of intact leaves from each growth temperature after photoinhibition for 300 min. at PFD of 1200 µmol·m⁻²·s⁻¹ and 20 C was followed for 450 min. at 10, 20 or 30 C at PFD of 20 µmol·m⁻²·s⁻¹. Both species were similar in their sensitivity to photoinhibition manifested as a temperature-dependent quenching of chlorophyll fluorescence (Fv/Fm) at 77 K, coupled with concomitant parallel reduction in light-saturated photosynthesis and photon yield of oxygen evolution. The chlorophyll fluorescence characteristics of each species at growth temperatures of 20 and 30 C were similar, while the fluorescence and photosynthetic characteristics of both species were higher at 20 C than at 30 C. Maximum rates of photosynthesis for Epipremnum aureum at 20 and 30 C were 11.5 and 6.8 µmol·m⁻²·s⁻¹, respectively. In X Fatshedera lizei maximum rates of photosynthesis at 20 and 30 C were 16.9 and 12.5 µmol·m⁻²·s⁻¹, respectively. X Fatshedera lizei leaves were more resistant than Epipremnum aureum to change in photosynthesis during photoinhibition. Photo-oxidative damage occurred in Epipremnum aureum leaves grown at 30 C after prolonged exposed to high PFD at 20 C or 15 C, whereas photoinhibitory treatments using higher leaf temperatures or lower PFD did not cause permanent damage. In each species the quenching of chlorophyll fluorescence induced by bright light depended upon an interaction with both growth and current leaf temperatures. Both species were similar in sensitivity to photoinhibition. However, the chilling tolerant X Fatshedera lizei was able to recover more efficiently than the chilling sensitive Epipremnum aureum at low temperatures, irrespective of the growth temperature. | en |
| dc.identifier.uri | http://hdl.handle.net/10179/16810 | |
| dc.language.iso | en | en |
| dc.publisher | Massey University | en |
| dc.rights | The Author | en |
| dc.rights | Attribution-NonCommercial-NoDerivs 3.0 New Zealand | * |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/nz/ | * |
| dc.title | Comparative study of temperature and light on vegetative growth of Epipremnum and Fatshedera : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Horticultural Science at Massey University | en |
| dc.type | Thesis | en |
| massey.contributor.author | Christie, Colin Bruce | |
| thesis.degree.discipline | Horticultural Science | en |
| thesis.degree.grantor | Massey University | en |
| thesis.degree.level | Doctoral | en |
| thesis.degree.name | Doctor of Philosophy (Ph.D.) | en |