Abstract
Seventy-one sorghum hybrids were evaluated for root rot resistance at Bethlehem and Potchefstroom, South Africa, from 1995/96 to 1998/99. Mean root rot severity ranged from 30.3% in PAN8494 to 41.3% in PAN8061 and root rot severity of hybrids differed significantly. However, highly significant genotype × environment interactions were recorded. Similarly, a significant environment × hybrid interaction was recorded for recovered root volume which ranged from 24.9 ml in Buster to 35.3 ml in CRN7686. Additive main effects and multiplicative interaction analyses (AMMI) were used to identify those hybrids in which root rot and root volume were significantly influenced by environment. Root discolouration and root volume were not correlated with plant length at both localities during 1997/98 and 1998/99. An index to quantify effective root volume (E) based on root rot severity and root volume i.e. E = [({100 - root rot severity)/100} × root volume] was significantly related to plant length during the 1997/98 (R2= 0.68 and R2= 0.51) and 1998/99 (R2 = 0.36 and R2= 0.62) seasons at Bethlehem and Potchefstroom respectively. Similarly, a significant relationship was recorded between effective root volume and head volume during 1998/99 at both localities (R2= 0.46 and R2= 0.63 respectively) but not with head length. Although seasonal variation in effective root volume was recorded, relatively little variation in mean effective root volumes of hybrids over the entire evaluation period was recorded.
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Claims 9
Claim · model-written summary
Root rot severity differed significantly among sorghum hybrids, ranging from 30.3% in PAN8494 to 41.3% in PAN8061.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mean root rot severity ranged from 30.3% in PAN8494 to 41.3% in PAN8061 and root rot severity of hybrids differed significantly.”
t0“sorghum hybrids”
Claim · model-written summary
Root rot severity showed highly significant genotype × environment interactions.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highly significant genotype × environment interactions were recorded”
t0“sorghum hybrids”
Claim · model-written summary
Recovered root volume ranged from 24.9 ml in Buster to 35.3 ml in CRN7686, with a significant environment × hybrid interaction.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant environment × hybrid interaction was recorded for recovered root volume which ranged from 24.9 ml in Buster to 35.3 ml in CRN7686”
t0“sorghum hybrids”
Claim · model-written summary
Root discolouration was not correlated with plant length at both sites in 1997/98 and 1998/99.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root discolouration and root volume were not correlated with plant length at both localities during 1997/98 and 1998/99”
t0“sorghum hybrids”
Claim · model-written summary
Root volume was not correlated with plant length at both sites in 1997/98 and 1998/99.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root discolouration and root volume were not correlated with plant length at both localities during 1997/98 and 1998/99”
t0“sorghum hybrids”
Claim · model-written summary
Effective root volume was significantly related to plant length in both seasons and localities.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“E = [({100 - root rot severity)/100} × root volume] was significantly related to plant length during the 1997/98 (R2= 0.68 and R2= 0.51) and 1998/99 (R2 = 0.36 and R2= 0.62) seasons at Bethlehem and Potchefstroom respectively”
t0“sorghum hybrids”
Claim · model-written summary
Effective root volume was significantly related to head volume at both sites in 1998/99.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant relationship was recorded between effective root volume and head volume during 1998/99 at both localities (R2= 0.46 and R2= 0.63 respectively)”
t0“sorghum hybrids”
Claim · model-written summary
Effective root volume was not significantly related to head length.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not with head length”
e1“between effective root volume and head volume”
t0“sorghum hybrids”
Claim · model-written summary
Effective root volume varied seasonally, but hybrid means varied relatively little across the evaluation period.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although seasonal variation in effective root volume was recorded, relatively little variation in mean effective root volumes of hybrids over the entire evaluation period was recorded”
t0“sorghum hybrids”