An influence of water regime on the light response in germination of lettuce (Lactuca sativa var. Grand Rapids) seed

1971 ◽  
Vol 49 (8) ◽  
pp. 1359-1362 ◽  
Author(s):  
A. I-hsiung Hsiao ◽  
G. M. Simpson
Keyword(s):  
Lactuca Sativa ◽  
White Light ◽  
Water Regime ◽  
Red Light ◽  
Light Response ◽  
Lactuca Sativa L ◽  
Grand Rapids ◽  
Influence Of Water ◽  
Low Levels ◽  
Petri Plate

The germination response of Lactuca sativa L. var. Grand Rapids to different light qualities (red, blue, far-red, white) compared with darkness, is modified by the level of water in the petri plate used for germinating the seeds. Far-red light and blue light inhibit germination for 24 h in all levels of water studied whereas red inhibits in low levels and promotes in high levels. White light inhibits germination in low levels of water but not in high levels. At least part of the inhibiting effects of light on germination in low levels of water may be associated with induced lowering of water potential in the seeds.

Seed water content in relation to phytochrome-mediated germination of lettuce seeds (Lactuca sativa L. var. Grand Rapids)

1971 ◽  
Vol 49 (1) ◽  
pp. 111-115 ◽  
Author(s):  
A. I-Hsiung Hsiao ◽  
William Vidaver
Keyword(s):  
Water Content ◽  
Lactuca Sativa ◽  
Red Light ◽  
Second Stage ◽  
Lettuce Seeds ◽  
Lactuca Sativa L ◽  
Grand Rapids ◽  
Two Stages ◽  
Seed Water Content ◽  
Stimulation Of

It is possible to distinguish two stages in the influence of light on the germination of Lactuca sativa var. Grand Rapids (lettuce) seeds. The first stage, which is represented by the photoactivation or transformation of phytochrome, requires only a relatively low seed water content. Slightly higher seed water content is required for maximum far-red light repression, than for red light stimulation of germination. The second stage is indicated by the well-known situation in which previous red irradiations of the seeds can enhance germination but this takes place only with relatively high seed water content. Phototransformed phytochrome appears to persist and to be susceptible to photoreversal for at least 24 h after irradiation in the seeds with relatively low water content.

scholarly journals End-Of-Day LED Lightings Influence the Leaf Color, Growth and Phytochemicals in Two Cultivars of Lettuce

Agronomy ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1475 ◽  
Author(s):  
Yamin Li ◽  
Rui Shi ◽  
Haozhao Jiang ◽  
Linyuan Wu ◽  
Yiting Zhang ◽  
...  
Keyword(s):  
Lactuca Sativa ◽  
White Light ◽  
Growth Stage ◽  
Dark Period ◽  
Red Light ◽  
Shoot Biomass ◽  
Artificial Light ◽  
Ultraviolet A ◽  
Leaf Color ◽  
Plant Factory

Four light treatments (W: white light; EOD-B: end-of-day enhanced blue light; EOD-FR: end-of-day supplementary far-red light; EOD-UV: end-of-day supplementary ultraviolet-A light) were designed to explore the effects of end-of-day (EOD) lightings (30 min before dark period) on leaf color, biomass and phytochemicals accumulation in two lettuce cultivars (Lactuca sativa cv. ‘Red butter’ and ‘Green butter’) in artificial light plant factory. EOD-FR stimulated the plant and shoot biomass of two cultivars, and EOD-B suppressed the growth of ‘Red butter’ but induced higher biomass in ‘Green butter’. EOD lightings generated brighter, greener and yellower leaf in ‘Red butter’ at harvest, but the highest lightness and the deepest redness of ‘Green butter’ leaf were observed in the middle growth stage. ‘Red butter’ had prominent higher contents of chlorophylls and carotenoids, while these pigments showed less sensitivity to the interaction of cultivars and EOD lightings. EOD lightings impeded the accumulation of anthocyanin in two cultivars, except EOD-UV slightly increased the anthocyanin contents in ‘Green butter’. EOD-UV strengthened the antioxidant capability of ‘Green butter’, but EOD lightings had different effects on the antioxidant and nutritional compound contents in two lettuce cultivars.

scholarly journals Penggunaan AB Mix dan Media Tanam terhadap Viabilitas Tanaman Selada (Lactuca sativa L. Var. New Grand Rapids) dalam Hydroponic Wick System

2020 ◽  
Vol 5 (1) ◽  
pp. 14-19
Author(s):  
Imam Safir Alwan Nurza ◽  
Diliviva Venesia
Keyword(s):  
Lactuca Sativa ◽  
Agricultural Sector ◽  
Growth And Yield ◽  
Lactuca Sativa L ◽  
Data Collection And Analysis ◽  
Grand Rapids ◽  
Wet Weight ◽  
Number Of Leaves ◽  
Resource Wealth ◽  
Natural Resource Wealth

Indonesia is a country that has abundant natural resources. One of the natural resource wealth is in the agricultural sector. The agricultural sector has a variety of agricultural commodities found in Indonesia. One of them is horticulture. Lettuce (Lactuca sativa L.) is a horticultural commodity. The purpose of this study was to determine the use of ab mix and planting media on lettuce (Lactuca sativa L. var New Grand Rapids) in increasing growth and yield after 40 Days After Planting (HST). This research method is an experiment with statistical data collection and analysis techniques. The results of this study are the number of leaves, plant height, and wet weight in the ab mix is ​​higher than aquades (control) because the ab mix provides nutrients for plant growth so that the plant becomes tall and enlarged with its leaves looking wide. However, the number of seeds germinated and plant viability in aquades (control) was higher than ab mix because there was an inorganic salt in ab mix that inhibited seed germination so that the seed membrane in absorbing water became impermeable.

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