A gene library is a collection of different DNA sequences from an organism, which has been cloned into a vector for ease of purification, storage and analysis. Gene library is a collection of cloned DNA designed for there high probability of finding any particular piece of the source DNA in the collection.

Explanation:

Germplasm:
Germplasm refers to the collection of plants and seeds that contain diverse alleles of all the genes of a particular crop. This collection is essential for preserving the genetic diversity of a crop species and for breeding new varieties with desirable traits.

Importance:
- Germplasm collections serve as a valuable resource for plant breeders and researchers to develop new varieties that are resistant to diseases, pests, and environmental stresses.
- They also help in improving crop yield, quality, and nutritional content.
- Germplasm collections can be used to reintroduce lost genes into breeding programs and to broaden the genetic base of cultivated crops.

Conservation:
- Germplasm conservation is important to safeguard against the loss of genetic diversity due to factors such as climate change, habitat destruction, and overexploitation.
- Gene banks and seed vaults are established to store and preserve germplasm collections for future generations.

Gene Library vs. Germplasm:
- While a gene library contains cloned DNA fragments of specific genes, a germplasm collection includes living plant materials with diverse alleles of all genes.
- Germplasm collections are more comprehensive and represent the entire genetic diversity of a crop species, making them valuable resources for breeding programs.
In conclusion, germplasm collections are crucial for the preservation and utilization of genetic diversity in crop species, contributing to the development of improved varieties with enhanced traits.