Ultraviolet-B irradiation of seeds affects photochemical and reproductive performance of the arid-environment ephemeral dimorphotheca pluvialis

Musil, C.F.

doi:10.1016/0098-8472(94)90019-1

Cited by 12 publications

(4 citation statements)

References 30 publications

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“…Musil 1996). UV‐B induced DNA damage in seeds has already been implicated in the alteration of subsequent adult plant photochemical and reproductive performance in a related annual species , D. pluvialis (Musil 1994), and it has been suggested that damage to DNA while partially dehydrated, i.e. during either or both pollen and seed stages, may be of particular importance (Musil 1996).…”

Section: Resultsmentioning

confidence: 99%

Repeated exposure to enhanced UV‐B radiation in successive generations increases developmental instability (leaf fluctuating asymmetry) in a desert annual

Midgley

Wand

Musil

1998

Plant Cell & Environment

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Populations of the desert annual Dimorphotheca sinuata, derived from a common seed stock, were exposed concurrently over four successive generations to either ambient (representing no stratospheric ozone depletion) or elevated (representing 20% stratospheric ozone depletion) UV-B levels during their complete life cycle. Leaf fluctuating asymmetry (FA) was measured in populations of plants grown from seeds of selected generations which had experienced different UV-B exposure histories, and from seeds collected from a wild population of this species which grows in a naturally enhanced UV-B environment. These measured plants had been grown in a greenhouse under essentially UV-B-free conditions. Leaf FA was significantly increased by greater numbers of enhanced UV-B exposures in the parentage of the seed. There was a linear to exponential dose-response relationship between number of UV-B exposure iterations in seed parentage and leaf FA, suggesting that damage to DNA caused by UV-B exposure during plant development may not be fully repaired, and thus be inherited by offspring and accumulated over successive generations in this species. Leaf FA of plants grown from seed from the wild population was not significantly greater than that of control plants whose parentage experienced only ambient UV-B exposures, although this negative result may have been due to low sampling intensity and measurement resolution, and the relatively low UV-B enhancement experienced by the wild population. We conclude that leaf FA may constitute a relatively sensitive yet inexpensive means of quantifying UV-B damage to plants.

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Section: Resultsmentioning

confidence: 99%

Repeated exposure to enhanced UV‐B radiation in successive generations increases developmental instability (leaf fluctuating asymmetry) in a desert annual

Midgley

Wand

Musil

1998

Plant Cell & Environment

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“…Note that this possible investment is not reflected in differences in seed mass, because seed mass did not differ among UV-B treatments (Table 2). Alternatively, the positive effect on offspring could be due to direct irradiation of the seeds; Musil (1994) reported such a positive effect in Dimorphotheca (Asteraceae). However, the seeds in our experiment were exposed to UV-B only while there were still in the fruit, whose thick walls would likely block most UV-B (Caldwell et al, 1995).…”

Section: Discussionmentioning

confidence: 99%

The effects of ultraviolet‐B radiation and intraspecific competition on growth, pollination success, and lifetime female fitness in Phacelia campanularia and P. purshii (Hydrophyllaceae)

Conner

Neumeier

2002

American J of Botany

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While a considerable amount of attention has been devoted to the effects that increased ultraviolet-B (UV-B) radiation has on vegetative plant growth and physiological function, the impact that UV-B may have on plant fitness has been the focus of fewer studies, with attention given primarily to a few crop species. Further, the possible interactions between UV-B and additional potential stresses found in natural environments have rarely been studied experimentally. Because the reported effects of increased UV-B on plant growth and fitness have been highly variable, studies that focus on factors that may lead to these differences in results are important for the formulation of accurate predictions about future plant success under varying UV-B levels. We examined the effects of UV-B dose and intraspecific competition on growth, phenology, pollen production, pollination success, fruit and seed production, and offspring quality in two species of Phacelia. Increased UV-B was neutral or beneficial for all traits, while competition was neutral or detrimental. There were no significant interactions between UV-B and competition in the parental generation. Phacelia campanularia offspring were unaffected by parental competition, but derived indirect beneficial effects on germination, growth, and fitness traits from parental enhanced UV-B.

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“…The findings that the TDHT dimer is obtained at a high yield, the quantum yield exceeding that of CPD-type (Jackson 1987), and dark repair is an order of magnitude less rapid than photoreaetivation repair (Pang & Hays 1991) suggest that there is an increased probability of permanent UV-B-indueed DNA damage in pollen and mutagenisis during DNA replieation (Jiang & Taylor 1993) after fertilization. Developing seeds, which contain DNA in a partially dehydrated state and are partially expo.sed to solar radiation in D. sinuata, may also have been sensitive to direet or indireet UV-B damage, since altered photochemical and reproductive performance has been observed in one Dimorphotheea species grown from UV-B-irradiated disc seed morphs (Musil 1994).…”

Section: Accumulated Uv-b Effectsmentioning

confidence: 99%

Accumulated effect of elevated ultraviolet‐B radiation over multiple generations of the arid‐environment annual Dimorphotheca sinuata DC. (Asteraceae)

Musil

1996

Plant Cell & Environment

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Two D. sinuata populations, established from the same seed batch, were cultured concurrently under ambient (2.5–8.9 kj m−2 d−1) and enhanced (4.7–11.4 kj m−2 d−1) ultraviolet‐B radiation for two consecutive generations. The two populations, designated low‐ and high‐UV‐B cultivars, were each grown for an additional generation under both UV‐B fluences at different alignments. Differences in plant performance were examined between UV‐B treatments (immediate UV‐B effects), cultivars (accumulated UV‐B effects), alignments and their interactions. Accumulated UV‐B had a greater effect on plant performance than immediate UV‐B. The former induced earlier reproductive effort, substantial (up to 35%) reductions in dry mass (stems, leaves and reproductive organs), decreased stem and inflorescence production, and diminished steady‐state fluorescence yields, chlorophyll a concentrations, pollen tube growth and germination of seeds set. The latter caused only diminished non‐photochemical quenching, reduced chlorophyll a, soluble sugar and starch concentrations, decreased pollen germination, and increased carotenoid contents. Interactions between UV‐B fluence level and alignment occurred for all measured dry mass parameters, leaf area, photosynthetic pigment and soluble sugar concentrations, and germination success of seeds set. These results indicate altered DNA integrity rather than an indirect UV‐B effect of photomorphogenic origin.

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Ultraviolet-B irradiation of seeds affects photochemical and reproductive performance of the arid-environment ephemeral dimorphotheca pluvialis

Cited by 12 publications

References 30 publications

Repeated exposure to enhanced UV‐B radiation in successive generations increases developmental instability (leaf fluctuating asymmetry) in a desert annual

Repeated exposure to enhanced UV‐B radiation in successive generations increases developmental instability (leaf fluctuating asymmetry) in a desert annual

The effects of ultraviolet‐B radiation and intraspecific competition on growth, pollination success, and lifetime female fitness in Phacelia campanularia and P. purshii (Hydrophyllaceae)

Accumulated effect of elevated ultraviolet‐B radiation over multiple generations of the arid‐environment annual Dimorphotheca sinuata DC. (Asteraceae)

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