Abstract
Roses generally experience a decrease in flower productivity and size in response to summer temperatures greater than 30°C that is common throughout the southern states of the USA. In College Station, Texas, the August mean and mean maximum summer temperatures can be 32 and 40°C, respectively. Under these extreme heat stress conditions, a large rose germplasm collection was evaluated for flowering intensity that takes into account both flower number and flower size. Of the 234 accessions evaluated, most showed moderate flowering during August and about 6% consistently had over 50% flower intensity in August. Experiments done in the growth chamber with potted roses containing young flower buds indicated that a 3-h heat shock (44°C) treatment resulted in decreased flower size and increased flower abscission. Consequently, this approach was used to assess the heat tolerance of 18 rose cultivars in this collection. The results indicated that field ratings of heat tolerance based on flower productivity were negatively correlated to flower abscission and leaf necrosis (r=-0.55* and r=-0.64**) and not correlated with leaf MTS (cell membrane thermostability) of the potted rose plants subjected to the heat shock treatment.
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Claims 7
Claim · model-written summary
Most rose accessions showed moderate flowering in August.
Verbatim
e0“Of the 234 accessions evaluated, most showed moderate flowering during August and about 6% consistently had over 50% flower intensity in August”
t0“Heat tolerance in garden roses”
Claim · model-written summary
About 6% of rose accessions consistently exceeded 50% flower intensity in August.
Verbatim
e0“Of the 234 accessions evaluated, most showed moderate flowering during August and about 6% consistently had over 50% flower intensity in August”
t0“Heat tolerance in garden roses”
Claim · model-written summary
A 3-h 44°C heat shock decreased rose flower size.
Not reportedComparator
Verbatim
e0“a 3-h heat shock (44°C) treatment resulted in decreased flower size and increased flower abscission”
t0“Heat tolerance in garden roses”
Claim · model-written summary
A 3-h 44°C heat shock increased rose flower abscission.
Not reportedComparator
Verbatim
e0“a 3-h heat shock (44°C) treatment resulted in decreased flower size and increased flower abscission”
t0“Heat tolerance in garden roses”
Claim · model-written summary
Field heat-tolerance ratings were negatively correlated with flower abscission after heat shock.
Verbatim
e0“field ratings of heat tolerance based on flower productivity were negatively correlated to flower abscission and leaf necrosis (r=-0.55* and r=-0.64**)”
t0“Heat tolerance in garden roses”
Claim · model-written summary
Field heat-tolerance ratings were negatively correlated with leaf necrosis after heat shock.
Verbatim
e0“field ratings of heat tolerance based on flower productivity were negatively correlated to flower abscission and leaf necrosis (r=-0.55* and r=-0.64**)”
t0“Heat tolerance in garden roses”
Claim · model-written summary
Field heat-tolerance ratings were not correlated with leaf cell membrane thermostability after heat shock.
Verbatim
e0“not correlated with leaf MTS (cell membrane thermostability) of the potted rose plants subjected to the heat shock treatment”
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