Recent Trend and Problems of Studies on the Photosynthesis of Tea Plant

Nakayama, Aogu

doi:10.5979/cha.1972.1

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…DRR was the highest when the air temperature was 21 to 23°C, and the ratio was relatively high at temperatures between 19 and 25°C, which thus may represent the thermal range over which the radiation use efficiency of tea shoots is the highest, and thus may be the optimal temperature range for tea tree growth. These values are similar to those (20–25°C) in a previous study on the photosynthesis of tea trees in Japan (Nakayama, 1972). The estimated weight ranges of shoots with different numbers of leaves showed that the observed FW values from the investigations that were not included in the estimated weight ranges were all smaller than the lower limits of these weight ranges.…”

Section: Discussionsupporting

confidence: 90%

A Growth Model to Estimate Shoot Weights and Leaf Numbers in Tea

Chen

Liu²,

Liu

et al. 2019

Agronomy Journal

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Increases in plant weight are strongly correlated with the amount of solar radiation that the plants receive. However, tea (Camellia sinensis) growth models are limited in their ability to integrate solar radiation into the predictions. In this study, we developed a predictive model for estimating tea shoot weights based on solar radiation and air temperatures. We combined information on daily solar radiation and daily air temperature to estimate the dry weight and fresh weight of a shoot in a tea crop. In addition, the range of shoot weights and leaf numbers could be estimated based on weather records. The estimated dry weight increases per unit of solar radiation for air temperatures of < 15, 15–17, 17–19, 19–21, 21–23, 23–25, 25–27, 27–29, and >29°C were 0.043, 0.074, 0.075, 0.334, 0.480, 0.283, 0.122, 0.079, and 0.028 g MJ–1, respectively. The model results suggest that the estimated shoot weights were highly correlated with the observed weights for both dry weight (r = 0.75, p < 0.001) and fresh weight (r = 0.79, p < 0.001). The estimated fresh weight ranges of shoots having two to six leaves were 0.31–3.48, 0.16–3.53, 0.44–5.60, 0.66–6.74, and 2.09–9.91 g, respectively. This study provided a statistical procedure that can be used to estimate the growth of tea crops for agricultural researchers. The results provide a means of assessing production and planning harvesting dates for tea farmers in Taiwan. Core Ideas A method to predict the weight of tea shoot was developed using field investigations. Data of solar radiation and air temperature were used to estimate shoot weights. The highest dry weight increases to solar radiation was 0.48 g MJ–1 at 21 to 23°C. The estimated weight range of shoots can be used to schedule dates for shoot plucking.

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Section: Discussionsupporting

confidence: 90%

A Growth Model to Estimate Shoot Weights and Leaf Numbers in Tea

Chen

Liu²,

Liu

et al. 2019

Agronomy Journal

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“…The photosynthetically active leaves of the dressed bushes not only exported more photosynthates, but also retained a large amount of photosynthates. The high content of photosynthates in leaves, primarily in the form of free sugar, can strengthen cold resistance in winter (Nakayama 1972). These leaves can provide the substrates required for early spring budding.…”

Section: Discussionmentioning

confidence: 99%

Effects of late-autumn fertilizer dressing on accumulation of photosynthates in tea (Camellia sinensis) and its contribution to spring tea quality

Shen¹,

Yang

Xie³

1990

J. Agric. Sci.

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S U M M A R YTwo-year-old tea bushes were given NPK fertilizer on . Late-autumn fertilizer dressing stimulated photosynthate accumulation in the whole bush, especially in overwintering leaves and roots. Large amounts of photosynthates in overwintering leaves provide the nutrition required for early spring budding. Lateautumn dressing also accelerated the transport of photosynthates from leaves to roots in winter, where photosynthates, with absorbed nitrogen, synthesized more animo acids, especially theanine and phenylalanine. The re-use of photosynthates stored in the roots of the dressed bushes during shoot growth the following spring was also facilitated by late-autumn dressing. The contents of amino acids and caffeine in the shoots of dressed bushes were much higher than those in the control, whereas the content of polyphenol was lower than in the control. The results indicate that late-autumn dressing improves the quality of spring green tea.

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