Similar Photosynthetic Performance in Low Light-Grown Isonuclear Triazine-Resistant and -Susceptible <i>Brassica napus</i> L

Hart, Jonathan J.; Stemler, Alan

doi:10.1104/pp.94.3.1295

Cited by 22 publications

(24 citation statements)

References 28 publications

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“…our laboratory, however, revealed that resistant plants grown under low PFD do not exhibit the decreased photon yield seen in plants grown under moderate to high PFD conditions (15). A smaller difference in growth is also seen in resistant and susceptible plants grown under low PFD.…”

mentioning

confidence: 87%

“…The loss of vigor that accompanies the resistance trait, however, is a serious drawback. Studies with nearly isogenic resistant and susceptible lines of Brassica napus L. revealed that resistant plants grew more slowly (JJ Hart, unpublished data; 5) and had a lower photon yield (15,18) than susceptible plants. Development of productive resistant crop varieties will depend on our understanding of the molecular mechanism that brings about the loss of photosynthetic performance and growth in plants with the resistance trait.…”

Section: And Methodsmentioning

confidence: 99%

“…Jursinic and Pearcy (18) Plants used in these experiments were grown from seeds produced by reciprocal crossing of individuals of the commercially available Brassica napus L. varieties 'Regent' and 'Triton' (15). All plants were grown in either a high or low light intensity growth chamber as described earlier (15).…”

Section: And Methodsmentioning

confidence: 99%

“…All plants were grown in either a high or low light intensity growth chamber as described earlier (15).…”

Section: And Methodsmentioning

confidence: 99%

“…The protocol for photon yield measurement was outlined previously (15). Each photon yield determination required approximately 30 min.…”

Section: Photon Yield Measurementmentioning

confidence: 99%

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High Light-Induced Reduction and Low Light-Enhanced Recovery of Photon Yield in Triazine-Resistant Brassica napus L

Hart¹,

Stemler²

1990

Plant Physiol.

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Triazine-resistant and -susceptible Brassica napus L. plants grown under low photon flux density (PFD) have previously been shown to exhibit a similar photon yield. In contrast, high PFDgrown resistant plants have a lower photon yield than high PFD- This work was initiated to test the hypothesis that high PFD light causes the differential reduction in photon yield observed in resistant plants. We exposed low PFD-grown B. napus leaf discs to high PFD and measured photon yield and other photosynthetic traits. We found that exposure to high PFD induces a differential decrease in photon yield in resistant plants. We also observed that the characteristics of recovery from decreased photon yield are consistent with the hypothesis that resistant plants are more sensitive to photoinhibition of PSII than susceptible plants. MATERIALS AND METHODSThe development of triazine resistance in crop plants is an attractive goal because of the potential benefits it offers for weed control.

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mentioning

confidence: 87%

Section: And Methodsmentioning

confidence: 99%

Section: And Methodsmentioning

confidence: 99%

“…All plants were grown in either a high or low light intensity growth chamber as described earlier (15).…”

Section: And Methodsmentioning

confidence: 99%

“…The protocol for photon yield measurement was outlined previously (15). Each photon yield determination required approximately 30 min.…”

Section: Photon Yield Measurementmentioning

confidence: 99%

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High Light-Induced Reduction and Low Light-Enhanced Recovery of Photon Yield in Triazine-Resistant Brassica napus L

Hart¹,

Stemler²

1990

Plant Physiol.

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psbA Mutation (valine219 to isoleucine) inPoa annua resistant to metribuzin and diuron

et al. 2000

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The Effect of Light and Temperature on Competition between Atrazine Susceptible and ResistantBrassica rapa

Plowman

Richards

1997

Annals of Botany

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Biotypes of Brassica rapa susceptible (S) and resistant (R) to atrazine were grown in competitive replacement series in all possible combinations of two light levels and three temperature regimes in controlled growth cabinets. Photosystem II function was investigated in all conditions by fluorescence-induction techniques. There were no significant differences in the dry weight of the two biotypes when grown in pure stands. In pure stands both biotypes produced more biomass under the high light level. Under high light both biotypes yielded more biomass at high temperature ; in low light they did so at medium temperature. Under high light conditions at high and medium temperatures the susceptible biotype had a greater photon yield and relative competitive ability than the resistant due to the greater vulnerability of triazine-resistant biotypes to photoinhibition. However, surprisingly, the resistant biotype was the better competitor, and had a higher photon yield, in the high light\low temperature regime. In low light no photoinhibition was expected and indeed there were no significant differences in any fluorescence parameters between the resistant and susceptible biotypes. Nevertheless, there were differences in the whole plant performance ; the susceptible biotype was a better competitor at low and medium temperatures, but the resistant biotype was better at high temperature. Relatively small variations in both light and temperature, well within the range encountered during British summer time, can have large effects on the relative competitiveness of triazine R and S biotypes in this species with implications for the spread of resistance genes through semi-natural communities. In light of predicted climate changes, interactions between climate and resistance should be studied across a wider range of herbicide types and weed species.# 1997 Annals of Botany Company

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Similar Photosynthetic Performance in Low Light-Grown Isonuclear Triazine-Resistant and -Susceptible Brassica napus L

Abstract: Triazine-resistant plants grown under moderate to high photon flux density (PFD) conditions exhibit decreased photon yield, decreased light-saturated 02 evolution and slower growth than triazine-susceptible plants. In this study we

Cited by 22 publications

References 28 publications

High Light-Induced Reduction and Low Light-Enhanced Recovery of Photon Yield in Triazine-Resistant Brassica napus L

High Light-Induced Reduction and Low Light-Enhanced Recovery of Photon Yield in Triazine-Resistant Brassica napus L

psbA Mutation (valine219 to isoleucine) inPoa annua resistant to metribuzin and diuron

The Effect of Light and Temperature on Competition between Atrazine Susceptible and ResistantBrassica rapa

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