Abstract
Photosynthesis and particularly photosystem II (PSII) is considered sensitive to high temperature. Our main objective in this study is to understand the role of phosphorus in heat treatment effects alleviation in tomato plant. In this work, the influence in three levels of phosphorus concentration (15, 31 and 60 ppm) assured by two forms of fertilisers (Mono-Ammonium Phosphate (MAP) (11-52-0) and NPK (15-15-15)) on tomato plants growth and heated-leaves treatment responses was investigated. Tomato plants were grown in hydroponic conditions and the effects of different P levels in change of chlorophyll content index, leaves dry weight and total P in root and shoot ratio were analysed. Results present that plants grown in low phosphorus concentration in hydroponic medium showed a decrease in chlorophyll content index, leaves dry weight and total root P/total shoot P ratio. Furthermore, heat treatment at 40 °C for 30 min significantly affects chlorophyll a fluorescence transient shape and photosynthetic performance index parameter (PIABS). We observed that the two forms of fertilisers positively alleviated the detrimental effects of high temperature on leaves of plants grown at high level of phosphorus. According to these results, the role of phosphorus in the alleviation of the effects of temperature on the electron transfer chain is observed. However, the mechanism by which P acts in this protection remains unclear. It is possible that P has a significant action at the level of the PSI, but further studies are necessary to elucidate the direct or indirect actions of P in this heat effect alleviation. Also, a combined action of P, N and other mineral elements is very likely in this protection against the negative effects of high temperatures.
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Claims 4
Claim · model-written summary
Low phosphorus concentration in hydroponic medium decreased chlorophyll content index, leaf dry weight and total root P/total shoot P ratio in tomato.
- Taxon
- Tomato plants
Solanum lycopersicume2 - Treatment
- low phosphorus concentration in hydroponic mediume1
- Outcome
- chlorophyll content index, leaves dry weight and total root P/total shoot P ratioe1
- Direction
- decreasee1
- Setting
- hydroponic conditionse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“plants grown in low phosphorus concentration in hydroponic medium showed a decrease in chlorophyll content index, leaves dry weight and total root P/total shoot P ratio”
e2“Tomato plants were grown in hydroponic conditions”
Claim · model-written summary
Heat treatment at 40 °C for 30 min significantly affected chlorophyll a fluorescence transient shape and PIABS in tomato.
- Taxon
- Tomato plantsSolanum lycopersicume2
- Treatment
- heat treatment at 40 °C for 30 mine3
- Outcome
- chlorophyll a fluorescence transient shape and photosynthetic performance index parameter (PIABS)e3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“heat treatment at 40 °C for 30 min significantly affects chlorophyll a fluorescence transient shape and photosynthetic performance index parameter (PIABS)”
e2“Tomato plants were grown in hydroponic conditions”
Claim · model-written summary
Two fertiliser forms alleviated the detrimental effects of high temperature on tomato leaves of plants grown at high phosphorus.
- Taxon
- Tomato plantsSolanum lycopersicume2
- Treatment
- two forms of fertiliserse4
- Outcome
- detrimental effects of high temperature on leavese4
- Direction
- alleviatede4
- Qualifier
- plants grown at high level of phosphoruse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“We observed that the two forms of fertilisers positively alleviated the detrimental effects of high temperature on leaves of plants grown at high level of phosphorus”
e2“Tomato plants were grown in hydroponic conditions”
Claim · model-written summary
The role of phosphorus in alleviating temperature effects on the electron transfer chain is observed in tomato.
- Taxon
- Tomato plantsSolanum lycopersicume2
- Treatment
- phosphoruse5
- Outcome
- alleviation of the effects of temperature on the electron transfer chaine5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“the role of phosphorus in the alleviation of the effects of temperature on the electron transfer chain is observed”
e2“Tomato plants were grown in hydroponic conditions”
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