The B chromosomes of maize typically undergo nondisjunction during the second microspore division (generative cell division). When the microspore nucleus contains only one B chromosome, two kinds of sperm result, one with two B chromosomes and one with no B chromosomes. The sperm with the B chromosomes preferentially fertilizes the egg cell. Previous studies of these phenomena have been limited...

In eukaryotes, coat protein complex II (COPII) vesicles mediate anterograde traffic from the endoplasmic reticulum to Golgi apparatus. Compared yeasts, plants have multiple COPII proteins; however, functional diversity among them is less well understood. SEC31A and SEC31B are outer proteins found in Arabidopsis. this study, we explored function of compared it with that various perspectives. was...

Isolated microspores of Brassica napus are developmentally programmed to form gametes; however, microspores can be reprogrammed through stress treatments to undergo appropriate divisions and form embryos. We are interested in the identification and isolation of factors and genes associated with the induction and establishment of embryogenesis in isolated microspores. Standard and normalized cDN...

Microspore cells develop into male gametophytes, which are released as pollen. Under certain stress conditions, the developmental pathway of microspores can be transformed an embryo instead pollen with haploid technology. In this experiment, 2 pepper breeding lines (G-1 and G-2) 4 nutrient media formed Murashige & Skoog (1962-MS) + 30 g L-1 sucrose or maltose without vitamins antioxidan...

Isolated microspore culture in vitro (IMC) is an advanced technique for producing doubled haploids. We developed a modified isolation method the Brassicaceae family, which exceeds results obtained by standard method. found that new allows increase percentage of microspores at embryogenic stage development culture. In spring rapeseed ‘Ratnik’ increases from 66.7% to 73%, and European radish ‘RBK...

‘Niagara Steck’ and Variegada’ are two grapevine varieties that arose spontaneously as somatic mutants of Rosada’. Berries characterize at young stages exhibiting a remarkable brown reticulated structure on the epidermis which develops into brown-bronze russet-like berries ripe. The mature have strongly acidic flesh. shows notable variegation in leaves berries. Meiotic studies were carried out ...

INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 597 Linkage intensity between the factor pairs Su su and Ta tu in maize. .................... 598 The relative frequency of crossing over between S, su and Tu tu in megaspore and microspore development. ...................................................