The role of photosynthesis in the recruitment of juvenile Quercus gambelii into mature Q. gambelii communities

Auken, O. W. Van; Bush, J. K.

doi:10.3159/09-ra-035.1

Cited by 8 publications

(12 citation statements)

References 81 publications

(70 reference statements)

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“…Mean maximum temperature is 26˚C in July and the mean minimum temperature is −5˚C in January [33] [34]. The mean midday (solar noon) photosynthetic flux density (PFD) below the Q. gambelii canopy and the daily average was calculated as was the mean midday PFD in the adjacent open meadow [20].…”

Section: Methodsmentioning

confidence: 99%

“…We calculated maximum photosynthesis (A max ), light saturating photo- [38]. We also included photosynthetic measurements for Q. gambelii made under similar conditions from a previous study in the analyses [20]. We used Tukey-Kramer HSD multiple comparison tests to determine differences between species.…”

Section: Methodsmentioning

confidence: 99%

“…Deviations in many Quercus populations appear to be related to community succession [6]- [11], more specifically to changes in light levels as succession proceeds, changes in fire frequency, and high levels of herbivory [12]- [20].…”

Section: Introductionmentioning

confidence: 99%

“…We identified a bottleneck between juvenile Q. gambelii plants and adult populations with no or only a few juveniles recruited into the adult population [5] [20]. Quercus gambelii is a wide spread species found in the mountains of the western and southwestern United States and northern Mexico ( Figure 1) [9].…”

Section: Introductionmentioning

confidence: 99%

“…It is xerophytic [28] and reproduces by sprouting more than by seeding, suggesting it is fire tolerant [10]. It is a sun plant or heliophyte with high photosynthetic rates in full sunlight with more than a 70% reduction in canopy shade [20]. It is probably an early successional species, but this is debated [8] [9] [10].…”

Section: Introductionmentioning

confidence: 99%

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Succession in <i>Quercus gambelii</i> (Gambel’s Oak) Woodlands

Auken¹,

Bush²

2017

AJPS

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Quercus gambelii (Gambel's oak) communities are found in the mountains of the western United States from Wyoming, Colorado, and Utah south into northern Mexico. Leaf gas exchange rates were measured for potential successional species in Q. gambelii communities. Daily average light level below the canopy was 125 µmol/m 2 /sec. Light response curves indicated that Pinus ponderosa and Q. gambelii had high maximum photosynthetic rates (14.13 and 11.21 µmol/m 2 /sec) and were sun species. Abies concolor (white fir) is a shade species with the lowest photosynthetic rate (3.71 µmol/m 2 /sec). At low light levels few differences in photosynthetic rates were found between the species. Pinus ponderosa and Q. gambelii maximum photosynthetic rates were reduced 71% -73% in shade and the shade species maximum photosynthetic rates were reduced by 50% -57%. Comparing annual gas exchange rates for all species showed that A. concolor had higher gas exchange rates and could replace Q. gambelii. Growth in height of Q. gambelii was a second order quadratic function reaching a plateau of about ten meters between 80 and 95 years. Growth estimates of height of A. concolor in canopy shade were exponential, which would allow seedlings to reach the Q. gambelii canopy in approximately 35 years. Abies concolor wood specific gravity is 56% lower than Q. gambelii, which means more carbon is put into growth in height to reach the canopy at low light levels and low photosynthetic rates. The additional shading it causes would further reduce Q. gambelii photosynthesis rates and prevent self-replacement in these Q. gambelii communities, leading to an A. concolor dominated community.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Succession in <i>Quercus gambelii</i> (Gambel’s Oak) Woodlands

Auken¹,

Bush²

2017

AJPS

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Differential expression and modification of proteins during ontogenesis in Malus domestica

et al. 2011

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Many morphological and physiological changes have been widely reported during ontogeny in higher plants. In order for the better understanding of the proteomic differences between ontogenetic phases, protein compositions between leaves of juvenile, adult vegetative and reproductive phases were compared in an apple (Malus domestica Borkh., Jonathan × Golden Delicious) seedling. Totally, 122 differentially expressed or modified protein spots were separated by DIGE. Of the 122 protein spots, 44, 17 and 29 were abundant in the leaf samples from the juvenile, adult vegetative and reproductive phases, respectively, two spots showed a lower level in the adult vegetative tissue, while the amount of protein increased in 21 spots during ontogeny and declined in nine spots. One hundred and fifteen spots were successfully picked and 95 spots were identified by MALDI-TOF-TOF high-resolution tandem mass spectrometry. Twenty-three juvenile phase abundant or down-regulated spots were photosynthesis-associated proteins, implying a juvenile phase-related photosynthesis enhancement. The expression of 10 enzymes and coenzymes involved in protein synthesis and catabolism was elevated in the adult reproductive phase or up-regulated during ontogeny, contributing a phase change-related activation in protein metabolism. Six proteins generated 30 differential gel spots via post-translational modifications. The differential expression of NADP-dependent D-sorbitol-6-phosphate dehydrogenase was confirmed by Western blotting in six seedlings derived from two hybrid populations. The results of semi-quantitative PCR indicate that some but not all of these proteomic changes were transcriptionally regulated.

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Utilization of lightflecks by seedlings of five dominant tree species of different subtropical forest successional stages under low-light growth conditions

et al. 2012

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We selected five typical tree species, including one early-successional species (ES) Pinus massoniana Lamb., two mid-successional species (MS) Schima superba Gardn. et Champ. and Castanopsis fissa (Champ. ex Benth.) Rehd. et Wils. and two late-successional species (LS) Cryptocarya concinna Hance. and Acmena acuminatissima (BI.) Merr et Perry., which represent the plants at three successional periods in Dinghushan subtropical forest succession of southern China. Potted seedlings of the five species were grown under 12% of full sunlight for 36 months. The ES and MS showed the slowest and fastest responses to lightflecks, respectively, which correlated with the rate of stomatal opening. In contrast to P. massoniana and C. concinna, the other three species exhibited a high induction loss. Early-successional species showed the lowest specific leaf area and chlorophyll content, the highest photosynthetic capacity (A(max)) and respiratory carbon losses (R(d)). Compared with ES and MS, LS showed lower A(max) and R(d). The five tree species showed a similar chlorophyll a/b ratio after long-term low-light adaptations. On the other hand, LS had a relatively higher de-epoxidation state to protect themselves from excess light during lightflecks. Our results indicated that (i) slower responses to lightflecks could partially explain why ES species could not achieve seedling regeneration in low-light conditions; (ii) fast responses to lightflecks could partially explain why MS species could achieve seedling regeneration in low-light conditions; and (iii) smaller respiratory carbon losses might confer on the LS species a competitive advantage in low-light conditions.

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The role of photosynthesis in the recruitment of juvenile Quercus gambelii into mature Q. gambelii communities

Cited by 8 publications

References 81 publications

Succession in <i>Quercus gambelii</i> (Gambel’s Oak) Woodlands

Succession in <i>Quercus gambelii</i> (Gambel’s Oak) Woodlands

Differential expression and modification of proteins during ontogenesis in Malus domestica

Utilization of lightflecks by seedlings of five dominant tree species of different subtropical forest successional stages under low-light growth conditions

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The role of photosynthesis in the recruitment of juvenile Quercus gambelii into mature Q. gambelii communities

Cited by 8 publications

References 81 publications

Succession in &lt;i&gt;Quercus gambelii&lt;/i&gt; (Gambel’s Oak) Woodlands

Succession in &lt;i&gt;Quercus gambelii&lt;/i&gt; (Gambel’s Oak) Woodlands

Differential expression and modification of proteins during ontogenesis in Malus domestica

Utilization of lightflecks by seedlings of five dominant tree species of different subtropical forest successional stages under low-light growth conditions

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Succession in <i>Quercus gambelii</i> (Gambel’s Oak) Woodlands

Succession in <i>Quercus gambelii</i> (Gambel’s Oak) Woodlands