The Effect of Low Irradiance on Leaf Nitrogen Allocation and Mesophyll Conductance to CO2 in Seedlings of Four Tree Species in Subtropical China

Tang, Jingchao; Sun, Baodi; Cheng, Rongjun; Shi, Zuomin; Luo, Da; Liu, Shirong; Centritto, Mauro

doi:10.3390/plants10102213

Cited by 6 publications

(2 citation statements)

References 54 publications

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“…In our study, seedlings grown with light intensity to mimic small (SG) and large canopy gap (LG) displayed significantly higher RGR m than that with ambient light intensity (Control, P < 0.05, Figure 1 and Supplementary Table 1). Moreover, we found that the development of leaf area (LA, Figures 2, 4) was one of the most important mechanisms to improve photosynthetic assimilation for plant individuals at enhanced light availability (Evans and Poorter, 2001;Tang et al, 2021). The formation of canopy gaps was verified to be beneficial for the understory regeneration in Jianfengling tropical montane rainforest (Feldmann et al, 2020), without considering the impacts on the direction of forest succession.…”

Section: Effect Of Light Condition Under Canopy Gap On Growth Of Seed...mentioning

confidence: 95%

Light effects on seedling growth in simulated forest canopy gaps vary across species from different successional stages

Zhou¹,

Thakur²,

Jia³

et al. 2023

Front. For. Glob. Change

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Tropical forests continue to suffer from various kinds of disturbances in the Anthropocene. An immediate impact of disturbances on forest ecosystems is the creation of numerous large and small canopy gaps, which dramatically affect forest structure and function. Yet, we know little about the effect of canopy gaps on forest successional trajectory. More specifically, the responses of seedlings from different successional stages to increased light intensity under large and small canopy gaps in understory remain unclear. In this study, dominant tree seedlings from early-, mid-, and late-successional stages were selected, respectively from a tropical montane forest in Hainan Island, China to study their growth rate, biomass and traits. Our results showed that the light condition under small canopy gaps (SG, 10–15% of full sunlight) and large canopy gaps (LG, 40–50% of full sunlight) induced greater increment of relative growth rates for seedlings from early- and mid-successional stages relative to that in late-successional stage. Both SG and LG also significantly increased photosynthesis rate, leaf area (LA), light saturation point (LSP), root mass ratio (RMR) and root: shoot ratio, but decreased specific leaf area (SLA) of seedlings across successional stages. Tree seedlings from the early-successional stage displayed the greatest decrease in leaf mass ratio, increase in LA, LSP, and RMR, in comparison to those from mid- and late- successional stages. Light condition and SLA were the most important factors for seedlings’ relative growth rate across successional stages. SLA connected the interaction between the light condition and successional stage on seedlings’ growth, thereby jointly explaining the 93% variation of seedlings’ growth, combining with area-based light saturated rate of CO2 assimilation. Our study highlights the distinct effect of disturbance-induced canopy gaps on seedling regeneration in the understory in tropical forest due to the variation of light intensity. We suspect that the seedlings from late-successional stage will recover relatively slow after disturbances causing canopy losses, which can have detrimental impacts on structure feature and successional trajectory in tropical forest, as well as forest-based ecosystem services.

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Section: Effect Of Light Condition Under Canopy Gap On Growth Of Seed...mentioning

confidence: 95%

Light effects on seedling growth in simulated forest canopy gaps vary across species from different successional stages

Zhou¹,

Thakur²,

Jia³

et al. 2023

Front. For. Glob. Change

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“…Furthermore, the effects of low light intensity on plant growth encompass various aspects, including the elongation of hypocotyls, internodes, and petioles, a reduction in branching, and alterations in leaf mass. These changes are integral components of the shade avoidance response triggered by low light intensity (Nozue et al 2015; Tang et al 2021). Therefore, gaining a comprehensive understanding of the intricate interplay between light intensity and leaves holds paramount importance for enhancing crop yield and quality, especially for crops harvested for their leaves.…”

Section: Introductionmentioning

confidence: 99%

Exploration of the intricacies of low light-induced changes in cigar tobacco leaf anticlinal growth: A holistic approach from anatomical and hormonal levels to gene expression

Ma,

Yang,

Ren

et al. 2023

Preprint

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Cigar tobacco stands as a pivotal economic crop, with its leaf growth and development profoundly influenced by light intensity. It specifically aims to investigate how leaf morphology and anticlinal growth respond to varying light intensities, including normal light intensity (NL–300 μmol m−2s−1) and lower light intensity (LL–100 μmol m−2s−1). The research elucidates significant morphological shifts in cigar tobacco leaves under LL, revealing notable alterations in leaf area, leaf length, and leaf width. Early reductions in leaf dimensions, ranging from 30% to 48%, were succeeded by a substantial enhancement in expansion rates from day 9 to day 26, contributing to expanded leaf surfaces at later stages. Upper epidermis thickness declined by 29-19%, with a notably slower expansion rate in the initial 20 days. Palisade cell length consistently decreased by 52-17%, corresponding with upper epidermis trends. Spongy tissue thickness was reduced by 31-12%, with a slower expansion rate in LL for the initial 14 days, and leaf thickness dropped by 34-11%. LL resulted in slower leaf anticlinal expansion, leading to reduced leaf thickness (LT). LL significantly influenced phytohormones in cigar tobacco leaves. Gibberellic acid (41% to 16%) and auxin (20% to 35%) levels were found in higher amounts, while cytokinin levels (19% to 5%) were lowered compared to NL, indicating the intricate regulatory role of light in hormonal dynamics. The observed increase in LT and different cell layers at specific time points (day 8, day 12, day 24, and day 28) under LL, although lower than NL, may be attributed to elevated expression of genes related to cell expansion, includingGRF1,XTH, andSAUR19at those time points. This comprehensive understanding elucidates the intricate mechanisms by which light intensity orchestrates the multifaceted processes governing leaf anatomy and anticlinal expansion in cigar tobacco plants.

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Effects of growth irradiance on growth, chlorophyll fluorescence and photosynthesis parameters of Gardenia jasminoides J. Ellis

et al. 2023

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The Effect of Low Irradiance on Leaf Nitrogen Allocation and Mesophyll Conductance to CO2 in Seedlings of Four Tree Species in Subtropical China

Cited by 6 publications

References 54 publications

Light effects on seedling growth in simulated forest canopy gaps vary across species from different successional stages

Light effects on seedling growth in simulated forest canopy gaps vary across species from different successional stages

Exploration of the intricacies of low light-induced changes in cigar tobacco leaf anticlinal growth: A holistic approach from anatomical and hormonal levels to gene expression

Effects of growth irradiance on growth, chlorophyll fluorescence and photosynthesis parameters of Gardenia jasminoides J. Ellis

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