Chlorophyll content, leaf gas exchange and growth of oriental lily as affected by shading

Abstract

We evaluated the effects of light conditions on leaf gas exchange, chlorophyll content, and growth responses in the Oriental lily (Lilium auratum L.) cv. Sorbonne. The experiment involved application on increasing shade densities (0, 60, 75, and 80%) to Sorbonne, and was carried out in the Horqin Sandy Land of northern China. Shade tests showed that growth of the lily was primarily affected by the level of irradiance. Photoinhibition occurred in the 0 and 60% shade treatments, but not in the 75 and 80% shade treatments. Shade treatments led to increase in photosynthetic pigment content, enhancement in photosynthetic effi ciency, and finally increase in the commercial value of the lily. P n , on the other hand, was lowest in the 80% shade treatment. So irradiance less than that achieved in the 80% shade treatment limited carbon assimilation and led to decreased plant growth. Plants grown under 75% shade displayed the optimal traits determining commercial value (plant height, flower length, flower diameter). Trends in P max , AQY, LSP and LCP to shade confirmed that the lily is a shade tolerant plant. Excessive light, therefore, was the primary factors limiting lily quality. Growth under conditions of 75% shade is recommended to improve photosynthetic efficiency and alleviate photodamage, thus increasing the commercial value of the lily grown in the Horqin Sandy Land.Abbreviations: AQY-apparent quantum yield; Chl a-chloro phyll a; Chl b-chlorophyll b; E-transpiration rate; g s -sto matal conductance; LCP-light compensation point; LSPlight saturation point; PAR-photosynthetically active radiation; P max -maximum net photosynthetic rate; P n -net photosyn thetic rate; R D -respiration rate.

Changes of starch and sucrose content and related gene expression during the growth and development of Lanzhou lily bulb

“…The plant began to wither gradually during the half-withered stage, and the fresh weight of stems and leaves also began to decline. Chlorophyll, as the absorption, transfer and transformation of light energy in photosynthesis, plays a key role in plant photosynthesis and is one of the important indexes reflecting plant photosynthesis [ 32 ]. The chlorophyll content began to decrease sharply after flowering ( Fig 2 ).…”

Shade tolerance response of legumes in terms of biomass accumulation, leaf photosynthesis, and chlorophyll pigment under reduced sunlight

“…Wang et al (2017) and Zhang et al (1995) reported that chlorophyll b per unit leaf area was significantly higher in shaded plants than in unshaded plants as a result of extensive stacking of grana (Cooper & Qualls, 1967), which, in turn, lead to a larger antenna for photosystem II and therefore more light being harvested in shaded plants. Zhang et al (2015) and Wittmann et al (2001) also reported that chlorophyll content of leaves was significantly affected by shading. Under shade, light absorption is optimized by increasing the density of chlorophyll pigments per unit leaf area.…”

Ultrastructure, adaptability, and alleviation mechanisms of photosynthetic apparatus in plants under waterlogging: A review

“…Chlorophylls (Chl) are the magnesium-containing tetrapyrroles necessary for light capturing and energy transmission in plants (Ohmiya et al 2014). In shade conditions, Lilium auratum absorbs light energy by synthesizing large amounts of Chl and increasing net photosynthesis, which can assure plant development, however, the influence of light intensity and waterlogging stress on Chl content has no consistent conclusion (Zhang et al 2015). The Chl concentration of Zea mays was reduced as shade increased, limiting photosynthetic and organic synthesis (Chen et al 2013).…”