Abstract
SUMMARY Barley ( Hordeum vulgare L. cv. Agneta) was cultivated hydroponically under continuous light, constant temperature and relative humidity. The relative growth rate (rgr) was kept at 25 % by an exponential supply of complete medium for 2 wk. The cultures were then transferred to phosphorus‐free media and the amounts of total P, fructans, starch, sucrose, glucose and fructose in sink and source leaves were measured at 0, 12, 24, 48, 72, 120 and 156 h. The capacity of net fructan synthesis (i.e. total activity of sucrose: sucrose 1‐fructosyltransferase (1‐SST) and sucrose: fructan 6‐fructosyltransferase (6‐SFT)), the activity of fructan exohydrolase (FEH), as well as the activity of acid invertase were also measured in the two types of leaves. Omission of P from the growth medium caused a decrease in the P content in both sink and source leaves, whereas the RGR was not affected during the 156 h of the experiment. The fructan concentration increased in low‐P plants whilst there was little or no effect on the concentrations of starch, sucrose, glucose and fructose. There was a slight increase in the capacity of net fructan synthesis in both sink and source leaves at 156 h after the onset of P‐starvation. There was no change in the activity of FEH or acid invertase. The results indicate that in barley leaves the mechanism for carbon partitioning into fructans is more sensitive towards low P conditions than the mechanism for carbon partitioning into starch.
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Claims 8
Claim · model-written summary
Omitting P from the medium decreased P content in sink and source barley leaves.
- Taxon
- Barley
.jpg?width=60)
Hordeum vulgaree1 - Material
- Agnetae1
- Organ / stage
- sink and source leavese2
- Treatment
- Omission of P from the growth mediume2
- Outcome
- P contente2
- Direction
- decreasee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e1“Barley ( Hordeum vulgare L. cv. Agneta)”
e2“Omission of P from the growth medium caused a decrease in the P content in both sink and source leaves, whereas the RGR was not affected during the 156 h of the experiment”
Claim · model-written summary
Omitting P from the medium did not affect relative growth rate of barley during 156 h.
- Taxon
- BarleyHordeum vulgaree1
- Treatment
- Omission of P from the growth mediume2
- Outcome
- RGRe2
- Direction
- not affectede2
- Qualifier
- during the 156 h of the experimente2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Barley ( Hordeum vulgare L. cv. Agneta)”
e2“Omission of P from the growth medium caused a decrease in the P content in both sink and source leaves, whereas the RGR was not affected during the 156 h of the experiment”
Claim · model-written summary
Fructan concentration increased in low-P barley plants.
- Taxon
- BarleyHordeum vulgaree1
- Treatment
- low‐Pe3
- Outcome
- fructan concentratione3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Barley ( Hordeum vulgare L. cv. Agneta)”
e3“The fructan concentration increased in low‐P plants whilst there was little or no effect on the concentrations of starch, sucrose, glucose and fructose”
Claim · model-written summary
Low-P had little or no effect on starch, sucrose and glucose concentrations in barley.
- Taxon
- BarleyHordeum vulgaree1
- Treatment
- low‐Pe3
- Outcome
- starch, sucrose, glucosee3
- Direction
- little or no effecte3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Barley ( Hordeum vulgare L. cv. Agneta)”
e3“The fructan concentration increased in low‐P plants whilst there was little or no effect on the concentrations of starch, sucrose, glucose and fructose”
Claim · model-written summary
Low-P had little or no effect on fructose concentration in barley.
- Taxon
- BarleyHordeum vulgaree1
- Treatment
- low‐Pe3
- Outcome
- fructosee3
- Direction
- little or no effecte3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Barley ( Hordeum vulgare L. cv. Agneta)”
e3“The fructan concentration increased in low‐P plants whilst there was little or no effect on the concentrations of starch, sucrose, glucose and fructose”
Claim · model-written summary
Low-P caused a slight increase in the capacity of net fructan synthesis in sink and source leaves at 156 h.
- Taxon
- BarleyHordeum vulgaree1
- Organ / stage
- sink and source leavese4
- Treatment
- onset of P‐starvatione4
- Outcome
- capacity of net fructan synthesise4
- Direction
- slight increasee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Barley ( Hordeum vulgare L. cv. Agneta)”
e4“There was a slight increase in the capacity of net fructan synthesis in both sink and source leaves at 156 h after the onset of P‐starvation”
Claim · model-written summary
Activity of FEH and acid invertase did not change in barley leaves.
- Taxon
- BarleyHordeum vulgaree1
- Outcome
- activity of FEH or acid invertasee5
- Direction
- no changee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Barley ( Hordeum vulgare L. cv. Agneta)”
e5“There was no change in the activity of FEH or acid invertase”
Claim · model-written summary
Carbon partitioning into fructans is more sensitive to low P than carbon partitioning into starch in barley leaves.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- low P conditionse6
- Outcome
- carbon partitioning into fructanse6
- Direction
- more sensitivee6
- Comparator
- carbon partitioning into starche6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Barley ( Hordeum vulgare L. cv. Agneta)”
e6“The results indicate that in barley leaves the mechanism for carbon partitioning into fructans is more sensitive towards low P conditions than the mechanism for carbon partitioning into starch”
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