What Is Heterospory. It is defined as the production of two spores that are different in size in the same plant. The female gametophyte never outgrows the limits of the megaspore.
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The smaller one is known as microspore and the larger one is known as megaspore. The smaller spore is known as a microspore which germinates to form a male gametophyte. The microspore germinates to form the male gametophyte and the megaspore germinates to form the female gametophyte. Web heterospory is a phenomenon in which two kinds of spores are borne by the same plant. Web heterospory is the production of spores of two different sizes and sexes by the sporophytes of land plants. Web heterospory is a phenomenon in which two kinds of spores are borne by the same plant. Heterospory evolved during the devonian period from isospory independently in several plant groups: Web heterospory, defined as the production of smaller male microspores and larger female megaspores, arose independently in all major vascular plant lineages (lycophytes, monilophytes and spermatophytes) and is considered a key innovation for terrestrial colonization (bateman & dimichele, 1994; There is an extreme reduction in the male gametophyte and, in most cases, it is nothing but an antheridium. The female gametophyte never outgrows the limits of the megaspore.
These spores differ in size. Web heterospory, defined as the production of smaller male microspores and larger female megaspores, arose independently in all major vascular plant lineages (lycophytes, monilophytes and spermatophytes) and is considered a key innovation for terrestrial colonization (bateman & dimichele, 1994; There is an extreme reduction in the male gametophyte and, in most cases, it is nothing but an antheridium. The microspore germinates to form the male gametophyte and the megaspore germinates to form the female gametophyte. In heterosporous forms the differentiation of sex can be predicted at the spore stages. The larger spore is called a megaspore which leads to forming a female gametophyte. The female gametophyte never outgrows the limits of the megaspore. The smaller one is known as microspore and the larger one is known as megaspore. Petersen & burd, 2016 ). Web heterospory is a phenomenon in which two kinds of spores are borne by the same plant. The megaspores are the bigger spores that produce a female gametophyte and the microspores are the smaller ones that produce a male gametophyte.
