Subjects: Biology >> Botany submitted time 2024-06-02 Cooperative journals: 《广西植物》
Abstract： The green leaves, variegated leaves and yellow leaves of Yulania denudata with variegated leaf were used as experimental materials. The anatomical structure and photosynthetic characteristics of three types of leaves were compared from the aspects of photosynthetic pigment content, leaf anatomical structure and light response curve, the factor of photosynthetic characteristics of Y. denudata with variegated leaf was revealed from anatomy. The the result of research as follows: (1) The yellow leaf spots of Y. denudata with variegated leaf is chlorophyll-type leaf spots formed by the decrease of chlorophyll content due to the abnormal structure of chloroplasts. (2) The structure of the thylakoids in the yellow region of the flower and leaf Y. denudata with variegated leaf was abnormal, and ATP synthesis was blocked, which hindered the progress of photosynthesis. (3) The anatomical structure showed that the palisade tissue of the green leaf was developed, the chloroplast integrity and pigment content were higher than that of the variegated leaf and the yellow leaf, and the net photosynthetic rate was higher. (4) There was a significant difference in the maximum net photosynthetic rate and light saturation point between the green leaf and the variegated leaf, and the green leaf can withstand a wider range of bright light than the variegated leaf. This study further elucidates that that the chloroplast structure of Y. denudata with variegated leaf affected its photosynthetic characteristics, and the results provided references for the breeding of fine varieties.
Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-28 Cooperative journals: 《中国科学院院刊》
Abstract： Big Earth Data for UN Sustainable Development Goals: Climate Change and Action
Subjects: Biology >> Botany >> Applied botany submitted time 2021-11-04 Cooperative journals: 《广西植物》
Abstract： In order to guide the rational fertilization of potted Hydrangea macrophylla, the effects of nitrogen (N), phosphorus (P) and potassium (K) at 4 levels (N, K2O: 0, 4, 8, 12 g plant-1; P2O5:0, 1.5, 3, 4.5 g·plan-1) on the growth and nutrient status of two-year-old potted H. macrophylla‘Hanatemari’ were investigated by the balanced fertilization design of “3414” method. The optimal fertilizer rate was determined by critical concentration method to provide evidence for rational fertilization of potted ‘Hanatemari’. The results were as follows: (1) N fertilization treatments, all of the seedling height, canopy diameter, plant growth index (PGI), aboveground and whole plant biomass of ‘Hanatemari’ increased with the increasing of N fertilizer application rate, while these parameters did not change significantly or slightly decreased as the N fertilizer rate exceeded level 2. (2) Low level of P (P1) and K (K1) were beneficial to the biomass accumulation of ‘Hanatemari’. (3) The nutrient contents in leaves and stems of ‘Hanatemari’ increased with the increasing of N, P and K fertilizer rates. However, the contents of K in roots did not change significantly with the increasing of K fertilizer levels, and there was no significant differences from the control. (4) According to the critical concentration method, the suitable contents of N in ‘Hanatemari’ leaves ranged from 35.31 to 46.64 g·kg-1, and for P ranged from1.88 to 2.28 g·kg-1. Considering nutrient content, PGI and production cost, the optimal fertilizerrates of N, P and K were N2 (8 g N·plant-1), P1 (1.5 g P2O5·plant-1) and K1 (4 g K2O·plant-1),respectively.
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