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Titolo:
The effect of photoautotrophy on photosynthesis and photoinhibition of gardenia plantlets during micropropagation
Autore:
Serret, MD; Trillas, MI; Matas, J; Araus, JL;
Indirizzi:
Univ Barcelona, Fac Biol, Unitat Fisiol Vegetal, E-08028 Barcelona, Spain Univ Barcelona Barcelona Spain E-08028 Vegetal, E-08028 Barcelona, Spain
Titolo Testata:
PHOTOSYNTHETICA
fascicolo: 2, volume: 39, anno: 2001,
pagine: 245 - 255
SICI:
0300-3604(2001)39:2<245:TEOPOP>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
GROWN IN-VITRO; JUGLANS-REGIA PLANTLETS; CHLOROPHYLL FLUORESCENCE; EX-VITRO; CO2 CONCENTRATION; HIGH-TEMPERATURE; ROSE SHOOTLETS; O-2 EVOLUTION; PHOTON YIELD; LIGHT;
Keywords:
chlorophyll fluorescence; Gardenia jasminoides; in vitro culture; irradiance; photosynthetic pigments; respiration; root induction; saccharose; shoot multiplication; vapour pressure deficit;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
64
Recensione:
Indirizzi per estratti:
Indirizzo: Araus, JL Univ Barcelona, Fac Biol, Unitat Fisiol Vegetal, Avgda Diagonal 645, E-08028 Barcelona, Spain Univ Barcelona Avgda Diagonal 645 Barcelona Spain E-08028 Spain
Citazione:
M.D. Serret et al., "The effect of photoautotrophy on photosynthesis and photoinhibition of gardenia plantlets during micropropagation", PHOTOSYNTHE, 39(2), 2001, pp. 245-255

Abstract

We studied the relationships between the degree of photoautotrophy, photosynthetic capacity, and extent of photoinhibition of Gardenia jasminoides Ellis plantlets. in vitro. Two successive micropropagation stages (shoot multiplication and root induction), and three culture conditions [tube cap closure, photosynthetic photon flux density (PPFD), and sucrose concentration] which may influence the development of photoautotrophy in vitro were assayed. The ratios of variable chlorophyll fluorescence to either maximal (F-v/F-m) or ground (F-v/F-0) values were low, irrespective of the culture stage or growing conditions. Incomplete development of the photosynthetic apparatus and permanent photoinhibition may be involved. However, F-v/F-m and F-v/F-0 increased from shoot multiplication to root induction owing to a decrease in F-0 and an increase in F-m. This suggests that photoinhibition decreases later during micropropagation, when the photoautotrophy of plantlets ismore advanced. The low sucrose content and high PPFD increased the photoinhibition of plantlets, whereas growth in tubes with permeable caps showed the opposite effect. The only culture factor with a significant (positive) effect on maximum photosynthetic rate (P-max) was PPFD. At shoot multiplication net photosynthetic rate (P-N) was positively correlated with the half time of the increase from F-0 to F-m (t(1/2)). Such association may be mainly due to a common response of both traits to higher PPFD in culture. Withineach culture stage, no relationship was observed between P-N and the degree of photoautotrophy, which was positively correlated with F-v/F-m and F-v/F-0 during root induction. During shoot multiplication, these correlations were not significant, or were even negative. Hence during the last stage ofmicropropagation, plantlets with a higher degree of photoautotrophy are less photoinhibited, whereas they do not follow this pattern at the earlier stage.

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Documento generato il 01/12/20 alle ore 01:09:42