Abstract
Cistanche phelypaea (L.) Cout. (Orobancaceae) was found parasitising the roots of the succulent shrublets Arthrocnemum macrostachyum (Moric.) K.Koch (Chenopodiaceae) in a coastal salt marsh in Qatar. Measurements were conducted to identify soil properties, host, and noninfected plants by soil excavations to expose the haustoria of the parasite attached to the host roots. The water potential, osmotic potential, pressure potential, and chemical analyses were determined in parasite, host, and noninfected plants. Crown diameter and dry mass of the host plants were smaller than in the noninfected plants. A gradient of water potential existed between the host root and the underground tuberous body of the parasite. Potassium was the major cation found in the parasite, while sodium was dominant in the host and noninfected plants. The nitrogen, soluble sugars, total amino acids, and starch contents of the parasite were higher than those of the host and noninfected plants. The high ratio of K^+ to Ca^{2+} in the parasite indicates that it is phloem-feeding. The high nutrient element contents and metabolic products in the parasite are possibly related to the creation of osmotic and water potential gradients between the host and C. phelypaea.
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Claims 9
Claim · model-written summary
Cistanche phelypaea parasitised Arthrocnemum macrostachyum roots in a coastal salt marsh in Qatar.
- Taxon
- Cistanche phelypaea
Cistanche phelypaeae0 - Interactor
- Arthrocnemum macrostachyum
Arthrocaulon macrostachyume0host - Outcome
- parasitising the rootse0
- Setting
- Qatare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cistanche phelypaea (L.) Cout. (Orobancaceae) was found parasitising the roots of the succulent shrublets Arthrocnemum macrostachyum (Moric.) K.Koch (Chenopodiaceae) in a coastal salt marsh in Qatar.”
Claim · model-written summary
Host plants had smaller crown diameter and dry mass than noninfected plants.
- Taxon
- Arthrocnemum macrostachyumArthrocaulon macrostachyume1
- Interactor
- Cistanche phelypaeaCistanche phelypaeae1parasite
- Outcome
- Crown diameter and dry masse0
- Direction
- smallere0
- Comparator
- noninfected plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crown diameter and dry mass of the host plants were smaller than in the noninfected plants.”
e1“Cistanche phelypaea (L.) Cout. (Orobancaceae) was found parasitising the roots of the succulent shrublets Arthrocnemum macrostachyum”
Claim · model-written summary
A water potential gradient existed between the host root and parasite tuberous body.
- Taxon
- Cistanche phelypaeaCistanche phelypaeat0
- Organ / stage
- underground tuberous bodye0
- Interactor
- Arthrocnemum macrostachyumArthrocaulon macrostachyume1host
- Outcome
- gradient of water potentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A gradient of water potential existed between the host root and the underground tuberous body of the parasite.”
t0“Cistanche phelypaea”
e1“shrublets Arthrocnemum macrostachyum”
Claim · model-written summary
Potassium was the major cation in the parasite.
- Taxon
- Cistanche phelypaeaCistanche phelypaeat0
- Outcome
- Potassium was the major catione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium was the major cation found in the parasite”
t0“Cistanche phelypaea”
Claim · model-written summary
Sodium dominated in host and noninfected plants.
- Taxon
- Arthrocnemum macrostachyumArthrocaulon macrostachyume1
- Outcome
- sodium was dominante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sodium was dominant in the host and noninfected plants.”
e1“shrublets Arthrocnemum macrostachyum”
Claim · model-written summary
Parasite nitrogen, soluble sugars and total amino acids contents were higher than those of host and noninfected plants.
- Taxon
- Cistanche phelypaeaCistanche phelypaeat0
- Outcome
- nitrogen, soluble sugars, total amino acidse0
- Direction
- highere0
- Comparator
- host and noninfected plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nitrogen, soluble sugars, total amino acids, and starch contents of the parasite were higher than those of the host and noninfected plants.”
t0“Cistanche phelypaea”
Claim · model-written summary
Parasite starch content was higher than that of host and noninfected plants.
- Taxon
- Cistanche phelypaeaCistanche phelypaeat0
- Outcome
- starch contentse0
- Direction
- highere0
- Comparator
- host and noninfected plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and starch contents of the parasite were higher than those of the host and noninfected plants.”
t0“Cistanche phelypaea”
Claim · model-written summary
The high K^+ to Ca^{2+} ratio indicates phloem feeding by the parasite.
- Taxon
- Cistanche phelypaeaCistanche phelypaeat0
- Outcome
- phloem-feedinge0
- Qualifier
- high ratio of K^+ to Ca^{2+}e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high ratio of K^+ to Ca^{2+} in the parasite indicates that it is phloem-feeding.”
t0“Cistanche phelypaea”
Claim · model-written summary
High parasite nutrient and metabolic product contents may relate to osmotic and water potential gradient creation.
- Taxon
- C. phelypaeaCistanche phelypaeae0
- Outcome
- creation of osmotic and water potential gradientse0
- Qualifier
- high nutrient element contents and metabolic productse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high nutrient element contents and metabolic products in the parasite are possibly related to the creation of osmotic and water potential gradients between the host and C. phelypaea.”