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'Betty Bland' rose Reviews & Comments
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Although Betty Bland has long been reported as diploid, possibly because it crosses easily with diploids, last year Dr. Zlesak noticed that its pollen was too large for a diploid, and when he did a root tip squash, discovered that it was triploid. See his paper, "Pollen Diameter and Guard Cell Length as Predictors of Ploidy in Diverse Rose Cultivars, Species and Breeding Lines."
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Thank you for sharing this insight with the HMF community.
Your thorough explanation and citing a reference was particularly helpful.
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The rose that Dr. Zlesak was sent as Betty Bland was misidentified. It was not Betty Bland. Betty Bland remains diploid.
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"Some were the first flowers I tried to improve in hardiness by breeding and at that time I had no facilities for growing roses under glass. None of the garden roses that I was able to secure in those early days would ripen their fruits out of doors so I was compelled to use Rosa rugosa and our native roses as seed parents. Betty Bland was the first worthwhile hybrid that I raised using the native Rosa blanda as seed parents and Captain Hayward as pollen plant. Capt. Hayward is one of the hardiest of the H.P. roses that we have grown at Dropmore and that probably accounts for the fact that Betty Bland is hardy throughout Western Canada."
Miscellaneous note among Frank Leith Skinner papers - no date
Province of Manitoba Archives
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"Betty Bland - A hybrid of our native Rosa blanda raised at Dropmore. Becomes a shrub to 6 feet high when established. It is covered with double pink roses during June. Its bright red branches also add to its decorative effect. Widely acclaimed and a deserving favorite. own root plants. Each $1.25"
Dropmore Hardy Plants 1948 p. 14
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The Canadian Department of Agriculture in the 1940's did chromosome counts of several shrub rose cultivars including 'Betty Bland' and it was a diploid.
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