Abstract
Cassava ( Manihot esculenta Crantz L.) is an important food and industrial crop in the tropics and holds potential in the subtropics. Cassava productivity is similar to C4 crop plants but its single-leaf net photosynthetic rate (Pn) is lower than C4 plants. This field investigation was conducted from 1982 to 1984 with seven cassava genotypes to study growth and gas exchange in a short-season environment. The Pn was determined on fully mature and attached leaves in an open system and canopy photosynthesis (CPn) was determined in a closed system between 1100 and 1500 hr using a portable plexiglass chamber. Leaf area index (LAI) of all cassava genotypes was similar except for Aug 1983 sampling and ranged from 2.40 to 6.16. The stomatal density was about ten times higher on the abaxial than the adaxial surface of cassava leaves. The abaxial stomatal conductance of water ranged from 0.23 cm s-1 to 1.94 cm s-1. Canopy photosynthesis differed significantly only during 1983 and varied from 1.31 to 1.97 mg CO2 m-2s-1. The Pn ranged from 0.48 to 1.21 mg CO2 m-2 s-1. ‘Senorita’ and ‘M Ven 218’, the two semi-forking genotypes, had generally higher HI than the forking genotypes. The HI was significantly correlated with CPn (r= 0.76*) and storage root yield (r=0.92*) during 1984. Cassava HI in a short season environment in the subtopics is similar to that in tropics. The relatively high productivity of cassava may be attributed to its high HI.
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Claims 11
Claim · model-written summary
Cassava genotypes had similar leaf area index except at the August 1983 sampling, with a range of 2.40 to 6.16.
- Taxon
- cassava
Manihot esculentae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf area index (LAI) of all cassava genotypes was similar except for Aug 1983 sampling and ranged from 2.40 to 6.16.”
t0“field-grown cassava”
Claim · model-written summary
Cassava leaf stomatal density was about tenfold higher on the abaxial than adaxial surface.
- Taxon
- cassavaManihot esculentae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stomatal density was about ten times higher on the abaxial than the adaxial surface of cassava leaves.”
t0“field-grown cassava”
Claim · model-written summary
Abaxial stomatal conductance of water ranged from 0.23 to 1.94 cm s-1.
- Taxon
- cassavaManihot esculentae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The abaxial stomatal conductance of water ranged from 0.23 cm s-1 to 1.94 cm s-1.”
t0“field-grown cassava”
Claim · model-written summary
Canopy photosynthesis differed significantly only in 1983 and ranged from 1.31 to 1.97 mg CO2 m-2s-1.
- Taxon
- cassavaManihot esculentae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Canopy photosynthesis differed significantly only during 1983 and varied from 1.31 to 1.97 mg CO2 m-2s-1.”
t0“field-grown cassava”
Claim · model-written summary
Single-leaf net photosynthetic rate ranged from 0.48 to 1.21 mg CO2 m-2 s-1.
- Taxon
- cassavaManihot esculentae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Pn ranged from 0.48 to 1.21 mg CO2 m-2 s-1.”
t0“field-grown cassava”
Claim · model-written summary
The semi-forking genotype Senorita generally had higher harvest index than forking genotypes.
- Taxon
- cassavaManihot esculentae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘Senorita’ and ‘M Ven 218’, the two semi-forking genotypes, had generally higher HI than the forking genotypes.”
t0“field-grown cassava”
Claim · model-written summary
The semi-forking genotype M Ven 218 generally had higher harvest index than forking genotypes.
- Taxon
- cassavaManihot esculentae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘Senorita’ and ‘M Ven 218’, the two semi-forking genotypes, had generally higher HI than the forking genotypes.”
t0“field-grown cassava”
Claim · model-written summary
Harvest index was significantly correlated with canopy photosynthesis in 1984 (r = 0.76).
- Taxon
- cassavaManihot esculentae0t0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The HI was significantly correlated with CPn (r= 0.76*) and storage root yield (r=0.92*) during 1984.”
t0“field-grown cassava”
Claim · model-written summary
Harvest index was significantly correlated with storage root yield in 1984 (r = 0.92).
- Taxon
- cassavaManihot esculentae0t0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The HI was significantly correlated with CPn (r= 0.76*) and storage root yield (r=0.92*) during 1984.”
t0“field-grown cassava”
Claim · model-written summary
Cassava harvest index in the short subtropical season was similar to that in the tropics.
- Taxon
- CassavaManihot esculentae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava HI in a short season environment in the subtopics is similar to that in tropics.”
t0“field-grown cassava”
Claim · model-written summary
The authors attribute relatively high cassava productivity to high harvest index.
- Taxon
- cassavaManihot esculentae0t0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relatively high productivity of cassava may be attributed to its high HI.”
t0“field-grown cassava”